INT 13

 

--------B-1300-------------------------------
INT 13 - DISK - RESET DISK SYSTEM
 AH = 00h
 DL = drive (if bit 7 is set both hard disks and floppy disks reset)
Return: AH = status (see #00234)
 CF clear if successful (returned AH=00h)
 CF set on error
Note: forces controller to recalibrate drive heads (seek to track 0)
 for PS/2 35SX, 35LS, 40SX and L40SX, as well as many other systems,
   both the master drive and the slave drive respond to the Reset
   function that is issued to either drive
SeeAlso: AH=0Dh,AH=11h,INT 21/AH=0Dh,INT 4D/AH=00h"TI Professional"
SeeAlso: INT 56"Tandy 2000",MEM 0040h:003Eh
--------B-1301-------------------------------
INT 13 - DISK - GET STATUS OF LAST OPERATION
 AH = 01h
 DL = drive (bit 7 set for hard disk)
Return: CF clear if successful (returned status 00h)
 CF set on error
 AH = status of previous operation (see #00234)
Note: some BIOSes return the status in AL; the PS/2 Model 30/286 returns the
   status in both AH and AL
SeeAlso: AH=00h,INT 4D/AH=01h,MEM 0040h:0041h,MEM 0040h:0074h

(Table 00234)
Values for disk operation status:
 00h successful completion
 01h invalid function in AH or invalid parameter
 02h address mark not found
 03h disk write-protected
 04h sector not found/read error
 05h reset failed (hard disk)
 05h data did not verify correctly (TI Professional PC)
 06h disk changed (floppy)
 07h drive parameter activity failed (hard disk)
 08h DMA overrun
 09h data boundary error (attempted DMA across 64K boundary or >80h sectors)
 0Ah bad sector detected (hard disk)
 0Bh bad track detected (hard disk)
 0Ch unsupported track or invalid media
 0Dh invalid number of sectors on format (PS/2 hard disk)
 0Eh control data address mark detected (hard disk)
 0Fh DMA arbitration level out of range (hard disk)
 10h uncorrectable CRC or ECC error on read
 11h data ECC corrected (hard disk)
 20h controller failure
 31h no media in drive (IBM/MS INT 13 extensions)
 32h incorrect drive type stored in CMOS (Compaq)
 40h seek failed
 80h timeout (not ready)
 AAh drive not ready (hard disk)
 B0h volume not locked in drive (INT 13 extensions)
 B1h volume locked in drive (INT 13 extensions)
 B2h volume not removable (INT 13 extensions)
 B3h volume in use (INT 13 extensions)
 B4h lock count exceeded (INT 13 extensions)
 B5h valid eject request failed (INT 13 extensions)
 B6h volume present but read protected (INT 13 extensions)
 BBh undefined error (hard disk)
 CCh write fault (hard disk)
 E0h status register error (hard disk)
 FFh sense operation failed (hard disk)
SeeAlso: #M0022
--------B-1302-------------------------------
INT 13 - DISK - READ SECTOR(S) INTO MEMORY
 AH = 02h
 AL = number of sectors to read (must be nonzero)
 CH = low eight bits of cylinder number
 CL = sector number 1-63 (bits 0-5)
      high two bits of cylinder (bits 6-7, hard disk only)
 DH = head number
 DL = drive number (bit 7 set for hard disk)
 ES:BX -> data buffer
Return: CF set on error
     if AH = 11h (corrected ECC error), AL = burst length
 CF clear if successful
 AH = status (see #00234)
 AL = number of sectors transferred (only valid if CF set for some
       BIOSes)
Notes: errors on a floppy may be due to the motor failing to spin up quickly
   enough; the read should be retried at least three times, resetting
   the disk with AH=00h between attempts
 most BIOSes support "multitrack" reads, where the value in AL
   exceeds the number of sectors remaining on the track, in which
   case any additional sectors are read beginning at sector 1 on
   the following head in the same cylinder; the MSDOS CONFIG.SYS command
   MULTITRACK (or the Novell DOS DEBLOCK=) can be used to force DOS to
   split disk accesses which would wrap across a track boundary into two
   separate calls
 the IBM AT BIOS and many other BIOSes use only the low four bits of
   DH (head number) since the WD-1003 controller which is the standard
   AT controller (and the controller that IDE emulates) only supports
   16 heads
 AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
   than 1024 cylinders by placing bits 10 and 11 of the cylinder number
   into bits 6 and 7 of DH
 under Windows95, a volume must be locked (see INT 21/AX=440Dh/CX=084Bh)
   in order to perform direct accesses such as INT 13h reads and writes
 all versions of MS-DOS (including MS-DOS 7 [Windows 95]) have a bug
   which prevents booting on hard disks with 256 heads (FFh), so many
   modern BIOSes provide mappings with at most 255 (FEh) heads
 some cache drivers flush their buffers when detecting that DOS is
   bypassed by directly issuing INT 13h from applications.  A dummy
   read can be used as one of several methods to force cache
   flushing for unknown caches (e.g. before rebooting).
BUGS: When reading from floppies, some AMI BIOSes (around 1990-1991) trash
   the byte following the data buffer, if it is not arranged to an even
   memory boundary.  A workaround is to either make the buffer word
   aligned (which may also help to speed up things), or to add a dummy
   byte after the buffer.
 MS-DOS may leave interrupts disabled on return from this function.
 Apparently some BIOSes or intercepting resident software have bugs
   that may destroy DX on return or not properly set the Carry flag.
   At least some Microsoft software frames calls to this function with
   PUSH DX, STC, INT 13h, STI, POP DX.
 on the original IBM AT BIOS (1984/01/10) this function does not disable
   interrupts for harddisks (DL >= 80h).  On these machines the MS-DOS/
   PC DOS IO.SYS/IBMBIO.COM installs a special filter to bypass the
   buggy code in the ROM (see CALL F000h:211Eh)
SeeAlso: AH=03h,AH=0Ah,AH=06h"V10DISK.SYS",AH=21h"PS/1",AH=42h"IBM"
SeeAlso: INT 21/AX=440Dh/CX=084Bh,INT 4D/AH=02h
--------B-1303-------------------------------
INT 13 - DISK - WRITE DISK SECTOR(S)
 AH = 03h
 AL = number of sectors to write (must be nonzero)
 CH = low eight bits of cylinder number
 CL = sector number 1-63 (bits 0-5)
      high two bits of cylinder (bits 6-7, hard disk only)
 DH = head number
 DL = drive number (bit 7 set for hard disk)
 ES:BX -> data buffer
Return: CF set on error
 CF clear if successful
 AH = status (see #00234)
 AL = number of sectors transferred
       (only valid if CF set for some BIOSes)
Notes: errors on a floppy may be due to the motor failing to spin up quickly
   enough; the write should be retried at least three times, resetting
   the disk with AH=00h between attempts
 most BIOSes support "multitrack" writes, where the value in AL
   exceeds the number of sectors remaining on the track, in which
   case any additional sectors are written beginning at sector 1 on
   the following head in the same cylinder; the CONFIG.SYS command
   MULTITRACK can be used to force DOS to split disk accesses which
   would wrap across a track boundary into two separate calls
 the IBM AT BIOS and many other BIOSes use only the low four bits of
   DH (head number) since the WD-1003 controller which is the standard
   AT controller (and the controller that IDE emulates) only supports
   16 heads
 AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
   than 1024 cylinders by placing bits 10 and 11 of the cylinder number
   into bits 6 and 7 of DH
 under Windows95, an application must issue a physical volume lock on
   the drive via INT 21/AX=440Dh before it can successfully write to
   the disk with this function
SeeAlso: AH=02h,AH=0Bh,AH=07h"V10DISK.SYS",AH=22h"PS/1",AH=43h"IBM"
SeeAlso: INT 21/AX=440Dh"DOS 3.2+",INT 4D/AH=03h
--------B-1304-------------------------------
INT 13 - DISK - VERIFY DISK SECTOR(S)
 AH = 04h
 AL = number of sectors to verify (must be nonzero)
 CH = low eight bits of cylinder number
 CL = sector number 1-63 (bits 0-5)
      high two bits of cylinder (bits 6-7, hard disk only)
 DH = head number
 DL = drive number (bit 7 set for hard disk)
 ES:BX -> data buffer (PC,XT,AT with BIOS prior to 1985/11/15)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234)
 AL = number of sectors verified
Notes: errors on a floppy may be due to the motor failing to spin up quickly
   enough (timeout error 80h); the write should be retried at least
   three times, resetting the disk with AH=00h between attempts
 on floppys, the operation should also be retried on media change
   (06h) detection.
 this function does not compare the disk with memory, it merely
   checks whether the sector's stored CRC matches the data's actual CRC
 the IBM AT BIOS and many other BIOSes use only the low four bits of
   DH (head number) since the WD-1003 controller which is the standard
   AT controller (and the controller that IDE emulates) only supports
   16 heads
 AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
   than 1024 cylinders by placing bits 10 and 11 of the cylinder number
   into bits 6 and 7 of DH
BUG: some Epson ROM BIOSes sometimes have problems properly handling this
   function. The workaround is to reset the disk (INT 13/AH=00h) before
   the call.
SeeAlso: AH=02h,AH=44h,INT 4D/AH=04h,INT 4D/AH=06h
--------B-1305-------------------------------
INT 13 - FLOPPY - FORMAT TRACK
 AH = 05h
 AL = number of sectors to format
 CH = track number
 DH = head number
 DL = drive number
 ES:BX -> address field buffer (see #00235)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234)
Notes: on AT or higher, call AH=17h first
 the number of sectors per track is read from the diskette parameter
   table pointed at by INT 1E
BUG: some old Compaq BIOSes have a bug when attempting to call this function
   from Windows Standard Mode with EMM386 loaded.  A possible workaround
   is to call this function from Real Mode e.g. through DPMI function
   "Call Real Mode function with FAR return" (see INT 31/AX=0301h).
SeeAlso: AH=05h"FIXED",AH=17h,AH=18h,INT 1E

Format of floppy format address field buffer entry (one per sector in track):
Offset Size Description (Table 00235)
 00h BYTE track number
 01h BYTE head number (0-based)
 02h BYTE sector number
 03h BYTE sector size (00h=128 bytes, 01h=256 bytes, 02h=512, 03h=1024)
--------B-1305-------------------------------
INT 13 - FIXED DISK - FORMAT TRACK
 AH = 05h
 AL = interleave value (XT-type controllers only)
 ES:BX -> 512-byte format buffer
  the first 2*(sectors/track) bytes contain F,N for each sector
     F = sector type
   00h for good sector
   20h to unassign from alternate location
   40h to assign to alternate location
   80h for bad sector
     N = sector number
 CH = cylinder number (bits 8,9 in high bits of CL)
 CL = high bits of cylinder number (bits 7,6)
 DH = head
 DL = drive
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234)
Notes: AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
   than 1024 cylinders by placing bits 10 and 11 of the cylinder number
   into bits 6 and 7 of DH
 for XT-type controllers on an AT or higher, AH=0Fh should be called
   first
 the IBM AT BIOS and many other BIOSes use only the low four bits of
   DH (head number) since the WD-1003 controller which is the standard
   AT controller (and the controller that IDE emulates) only supports
   16 heads
 not all controller support sector types 20h and 40h
 under Windows95, an application must issue a physical volume lock on
   the drive via INT 21/AX=440Dh before it can successfully write to
   the disk with this function
SeeAlso: AH=05h"FLOPPY",AH=06h"FIXED",AH=07h"FIXED",AH=0Fh,AH=18h,AH=1Ah
--------d-1305-------------------------------
INT 13 - Future Domain SCSI BIOS - SEND SCSI MODE SELECT COMMAND
 AH = 05h
 DL = hard drive ID
 ES:BX -> mode select data (see #00236)
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234)
Notes: this function can be called before AH=07h"SCSI" or AH=06h"SCSI" to
   format a SCSI disk with the desired parameters
 the mode select data below is from the SCSI-1 specification
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=06h"SCSI",AH=07h"SCSI",INT 4F/AX=8100h

Format of Future Domain SCSI mode select data:
Offset Size Description (Table 00236)
 00h BYTE number of bytes of remaining data (12 + vendor unique length)
 01h BYTE reserved (0)
 02h BYTE medium type (0 for hard disk)
 03h BYTE reserved (0)
 04h BYTE block descriptor length (8)
 05h BYTE density code (0 for hard disk)
 06h  3 BYTEs (big-endian) number of blocks (000000h for entire disk)
 09h BYTE reserved (0)
 0Ah  3 BYTEs (big-endian) block length (512 standard, or 256)
 0Dh ??? vendor-specific parameter bytes (optional)
--------d-13057FSI324D-----------------------
INT 13 - 2M - FORMAT TRACK
 AX = 057Fh
 SI = 324Dh ("2M")
 CH = track number
 DH = head number
 DL = drive number
 ES:BX -> boot sector of future 2M diskette
Return: CF set on error
 CF clear if successful
 AH = status (see #00234)
Program: 2M is a TSR developed by Ciriaco Garc de Celis to support
   non standard diskettes with 820-902/1476-1558K (5.25 DD/HD)
   and 984-1066/1804-1886K/3608-3772K (3.5 DD/HD/ED)
InstallCheck: must search for a "CiriSOFT:2M:1.3" or "CiriSOFT:2MX:3.0" or
   similar (recomended ":2M:", ":2MX:", or ":2MB:" substrings) in the
   CiriSOFT TSR interface
Notes: it is not necessary to call AH=17h or AH=18h first (will be ignored)
 the diskette format must always begin on cylinder 0 head 0
 the boot sector can be obtained from an already-formatted 2M diskette
   (by calling AH=02h with head number 00h in 2M v1.x and with head
   number 80h for 2M v2+)
 since 2M v2.0, the BOOT sector is emulated using the first physical
   sector of FAT2; the second-sixth physical sectors of FAT2 in HD or ED
   diskettes store the SuperBOOT code. To skip the FAT2 emulation (using
   FAT1) of 2M, in order to read the SuperBOOT code, head number must be
   80h-81h instead 0-1 (bit 7 active) in standard read/write functions.
   This lets diskcopy programs format 2M target diskettes copying
   SuperBOOT code. If the target diskette is already 2MF formatted
   (containing boot code) this trick it is not necessary.
 when using STV technology (offset 65 of boot sector equal to 1) it is
   necessary to write the full track before formatting (except track 0
   side 0) to complete the format and skip future CRC errors on read; in
   track 0 side 1 the head used must be 81h instead 1. Diskcopy programs
   may do a format-write-verify sequential phases to improve performance
SeeAlso: AH=05h"FLOPPY",AH=18h/CX=5055h,INT 2F"CiriSOFT"
--------B-1306-------------------------------
INT 13 - FIXED DISK - FORMAT TRACK AND SET BAD SECTOR FLAGS (XT,PORT)
 AH = 06h
 AL = interleave value
 CH = cylinder number (bits 8,9 in high bits of CL)
 CL = sector number
 DH = head
 DL = drive
Return: AH = status code (see #00234)
Note: AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
   than 1024 cylinders by placing bits 10 and 11 of the cylinder number
   into bits 6 and 7 of DH
SeeAlso: AH=05h"FIXED",AH=07h"FIXED"
--------d-1306-------------------------------
INT 13 - Future Domain SCSI BIOS - FORMAT DRIVE WITH BAD SECTOR MAPPING
 AH = 06h
 AL = interleave
      (0 = default, 1 = consecutive sectors, 2 - 255 = vendor unique)
 DL = hard drive ID
 DH = defect list info (see #00237)
 ES:BX -> defect table A, B or C (see #00238,#00239,#00240)
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234)
Notes: block addresses must be in ascending order (for table B, cylinder is
   most significant, byte from index least significant; for table C,
   cylinder is most significant, sector number least significant)
 table B defect bytes from index of FFFFFFFFh indicates that the entire
   track shall be reassigned
 table C defect sector number of FFFFFFFFh indicates that the entire
   track shall be reassigned
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=05h"SCSI",AH=06h"FIXED",AH=07h"SCSI"

Bitfields for Future Domain SCSI defect list info:
Bit(s) Description (Table 00237)
 7-5 drive LUN
 4 defect list is available
 3 defect list is complete (erase drive's defect list)
 2-0 defect table format
 (000=use defect table A, 100=use defect table B,
  101=use defect table C)

Format of Future Domain SCSI defect table A:
Offset Size Description (Table 00238)
 00h WORD number of bytes remaining in table
 02h BYTE reserved (0)
 03h BYTE reserved (0)
 04h WORD (big-endian) defect list length (4*number of defects)
 06h  4 DWORDs (big-endian) defect block addresses

Format of Future Domain SCSI defect table B:
Offset Size Description (Table 00239)
 00h WORD number of bytes remaining in table
 02h BYTE reserved (0)
 03h BYTE reserved (0)
 04h WORD (big-endian) defect list length (8*number of defects)
 06h 8N BYTEs defect list [array] (see #00241)

Format of Future Domain SCSI defect table C:
Offset Size Description (Table 00240)
 00h WORD number of bytes remaining in table
 02h BYTE reserved (0)
 03h BYTE reserved (0)
 04h WORD (big-endian) defect list length (8*number of defects)
 06h 8N BYTEs defect list [array] (see #00241)

Format of Future Domain SCSI defect list entry:
Offset Size Description (Table 00241)
 00h  3 BYTEs (big-endian) cylinder number of defect
 03h BYTE head number of defect
 04h DWORD (big-endian) defect bytes from index
--------d-1306-------------------------------
INT 13 - Adaptec AHA-154xA/Bustek BT-542 BIOS - IDENTIFY SCSI DEVICES
 AH = 06h
Return: AH = status code (see #00234)
 CF clear if successful
     AL = first drive supported
  (80h nonconcurrent operation, 81h concurrent operation)
 CF set on error
Desc: determine the number of the first supported SCSI drive
Note: the return value is 80h when two SCSI drives are supported, 81h if
   only one SCSI drive is installed
SeeAlso: AH=08h"PC",#00732 at INT 1A/AX=B102h
--------d-1306-------------------------------
INT 13 - V10DISK.SYS - READ DELETED SECTORS
 AH = 06h
 AL = number of sectors
 CH = cylinder number (bits 8,9 in high bits of CL)
 CL = sector number
 DH = head
 DL = drive
 ES:BX -> buffer
Return: AH = status code (see #00234)
Program: V10DISK.SYS is a driver for the Flagstaff Engineering 8" floppies
SeeAlso: AH=02h,AH=07h"V10DISK.SYS"
--------B-1307-------------------------------
INT 13 - FIXED DISK - FORMAT DRIVE STARTING AT GIVEN TRACK (XT,PORT)
 AH = 07h
 AL = interleave value (XT only)
 ES:BX = 512-byte format buffer (see AH=05h)
 CH = cylinder number (bits 8,9 in high bits of CL)
 CL = sector number
 DH = head
 DL = drive
Return: AH = status code (see #00234)
Note: AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
   than 1024 cylinders by placing bits 10 and 11 of the cylinder number
   into bits 6 and 7 of DH
SeeAlso: AH=05h"FIXED",AH=06h"FIXED",AH=1Ah
--------d-1307-------------------------------
INT 13 - Future Domain SCSI BIOS - FORMAT DRIVE
 AH = 07h
 AL = interleave (0 = default, 1 = consecutive sectors,
        2 - 255 = vendor unique)
 DL = hard drive ID
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234)
SeeAlso: AH=05h"SCSI",AH=06h"SCSI",AH=07h"FIXED"
--------d-1307-------------------------------
INT 13 - V10DISK.SYS - WRITE DELETED SECTORS
 AH = 07h
 AL = number of sectors
 CH = cylinder number (bits 8,9 in high bits of CL)
 CL = sector number
 DH = head
 DL = drive
 ES:BX -> buffer
Return: AH = status code (see #00234)
Program: V10DISK.SYS is a driver for the Flagstaff Engineering 8" floppies
SeeAlso: AH=03h,AH=06h"V10DISK.SYS"
--------B-1308-------------------------------
INT 13 - DISK - GET DRIVE PARAMETERS (PC,XT286,CONV,PS,ESDI,SCSI)
 AH = 08h
 DL = drive (bit 7 set for hard disk)
 ES:DI = 0000h:0000h to guard against BIOS bugs
Return: CF set on error
     AH = status (07h) (see #00234)
 CF clear if successful
     AH = 00h
     AL = 00h on at least some BIOSes
     BL = drive type (AT/PS2 floppies only) (see #00242)
     CH = low eight bits of maximum cylinder number
     CL = maximum sector number (bits 5-0)
   high two bits of maximum cylinder number (bits 7-6)
     DH = maximum head number
     DL = number of drives
     ES:DI -> drive parameter table (floppies only)
Notes: may return successful even though specified drive is greater than the
   number of attached drives of that type (floppy/hard); check DL to
   ensure validity
 for systems predating the IBM AT, this call is only valid for hard
   disks, as it is implemented by the hard disk BIOS rather than the
   ROM BIOS
 the IBM ROM-BIOS returns the total number of hard disks attached
   to the system regardless of whether DL >= 80h on entry.
 Toshiba laptops with HardRAM return DL=02h when called with DL=80h,
   but fail on DL=81h.  The BIOS data at 40h:75h correctly reports 01h.
 may indicate only two drives present even if more are attached; to
   ensure a correct count, one can use AH=15h to scan through possible
   drives
 Reportedly some Compaq BIOSes with more than one hard disk controller
   return only the number of drives DL attached to the corresponding
   controller as specified by the DL value on entry.  However, on
   Compaq machines with "COMPAQ" signature at F000h:FFEAh,
   MS-DOS/PC DOS IO.SYS/IBMBIO.COM call INT 15/AX=E400h and
   INT 15/AX=E480h to enable Compaq "mode 2" before retrieving the count
   of hard disks installed in the system (DL) from this function.
 the maximum cylinder number reported in CX is usually two less than
   the total cylinder count reported in the fixed disk parameter table
   (see INT 41h,INT 46h) because early hard disks used the last cylinder
   for testing purposes; however, on some Zenith machines, the maximum
   cylinder number reportedly is three less than the count in the fixed
   disk parameter table.
 for BIOSes which reserve the last cylinder for testing purposes, the
   cylinder count is automatically decremented
 on PS/1s with IBM ROM DOS 4, nonexistent drives return CF clear,
   BX=CX=0000h, and ES:DI = 0000h:0000h
 machines with lost CMOS memory may return invalid data for floppy
   drives. In this situation CF is cleared, but AX,BX,CX,DX,DH,DI,
   and ES contain only 0.  At least under some circumstances, MS-DOS/
   PC DOS IO.SYS/IBMBIO.COM just assumes a 360 KB floppy if it sees
   CH to be zero for a floppy.
 the PC-Tools PCFORMAT program requires that AL=00h before it will
   proceed with the formatting
 if this function fails, an alternative way to retrieve the number
   of floppy drives installed in the system is to call INT 11h.
 In fact, the MS-DOS/PC-DOS IO.SYS/IBMBIO.COM attempts to get the
   number of floppy drives installed from INT 13/AH=08h, when INT 11h
   AX bit 0 indicates there are no floppy drives installed. In addition
   to testing the CF flag, it only trusts the result when the number of
   sectors (CL preset to zero) is non-zero after the call.
BUGS: several different Compaq BIOSes incorrectly report high-numbered
   drives (such as 90h, B0h, D0h, and F0h) as present, giving them the
   same geometry as drive 80h; as a workaround, scan through disk
   numbers, stopping as soon as the number of valid drives encountered
   equals the value in 0040h:0075h
 a bug in Leading Edge 8088 BIOS 3.10 causes the DI,SI,BP,DS, and ES
   registers to be destroyed
 some Toshiba BIOSes (at least before 1995, maybe some laptops???
   with 1.44 MB floppies) have a bug where they do not set the ES:DI
   vector even for floppy drives. Hence these registers should be
   preset with zero before the call and checked to be non-zero on
   return before using them.  Also it seems these BIOSes can return
   wrong info in BL and CX, as S/DOS 1.0 can be configured to preset
   these registers as for an 1.44 MB floppy.
 the PS/2 Model 30 fails to reset the bus after INT 13/AH=08h and
   INT 13/AH=15h. A workaround is to monitor for these functions
   and perform a transparent INT 13/AH=01h status read afterwards.
   This will reset the bus. The MS-DOS 6.0 IO.SYS takes care of
   this by installing a special INT 13h interceptor for this purpose.
 AD-DOS may leave interrupts disabled on return from this function.
 Some Microsoft software explicitly sets STI after return.
SeeAlso: AH=06h"Adaptec",AH=13h"SyQuest",AH=48h,AH=15h,INT 1E
SeeAlso: INT 41"HARD DISK 0"

(Table 00242)
Values for diskette drive type:
 01h 360K
 02h 1.2M
 03h 720K
 04h 1.44M
 05h ??? (reportedly an obscure drive type shipped on some IBM machines)
 2.88M on some machines (at least AMI 486 BIOS)
 06h 2.88M
 10h ATAPI Removable Media Device
--------d-1308-------------------------------
INT 13 - V10DISK.SYS - SET FORMAT
 AH = 08h
 AL = number of sectors
 CH = cylinder number (bits 8,9 in high bits of CL)
 CL = sector number
 DH = head
 DL = drive
Return: AH = status code (see #00234)
Program: V10DISK.SYS is a driver for the Flagstaff Engineering 8" floppies
Note: details not available
SeeAlso: AH=03h,AH=06h"V10DISK.SYS"
--------y-130800DLF0-------------------------
INT 13 - SecureDrive - INSTALLATION CHECK
 AX = 08000h
 DL = F0h
Return: AX = EDCBh for version 1.0-1.2
 AX = EDCCh for version 1.3
 CX = code segment
 DX = data address within code segment
Program: SecureDrive by Mike Ingle <mikeingle@delphi.com> allows you to create
   an encrypted partition on your harddisk.
--------B-1309-------------------------------
INT 13 - HARD DISK - INITIALIZE CONTROLLER WITH DRIVE PARAMETERS (AT,PS)
 AH = 09h
 DL = drive (80h for first, 81h for second)
Return: CF clear if successful
 CF set on error
 AH = status (see #00234)
Notes: on the PC and XT, this function uses the parameter table pointed at by
   INT 41
 on the AT and later, this function uses the parameter table pointed at
   by INT 41 if DL=80h, and the parameter table pointed at by INT 46 if
   DL=81h
SeeAlso: INT 41"HARD DISK 0",INT 46"HARD DISK 1"
--------B-130A-------------------------------
INT 13 - HARD DISK - READ LONG SECTOR(S) (AT and later)
 AH = 0Ah
 AL = number of sectors (01h may be only value supported)
 CH = low eight bits of cylinder number
 CL = sector number (bits 5-0)
      high two bits of cylinder number (bits 7-6)
 DH = head number
 DL = drive number (80h = first, 81h = second)
 ES:BX -> data buffer
Return: CF clear if successful
 CF set on error
 AH = status (see #00234)
 AL = number of sectors transferred
Notes: this function reads in four to seven bytes of error-correcting code
   along with each sector's worth of information
 data errors are not automatically corrected, and the read is aborted
   after the first sector with an ECC error
 used for diagnostics only on PS/2 systems; IBM officially classifies
   this function as optional
BUG: on the original IBM AT BIOS (1984/01/10) this function does not disable
   interrupts for harddisks (DL >= 80h). On these machines the MS-DOS/
   PC DOS IO.SYS/IBMBIO.COM installs a special filter to bypass the
   buggy code in the ROM (see CALL F000h:211Eh)
SeeAlso: AH=02h,AH=0Bh,MEM 0040h:0074h
--------B-130B-------------------------------
INT 13 - HARD DISK - WRITE LONG SECTOR(S) (AT and later)
 AH = 0Bh
 AL = number of sectors (01h may be only value supported)
 CH = low eight bits of cylinder number
 CL = sector number (bits 5-0)
      high two bits of cylinder number (bits 7-6)
 DH = head number
 DL = drive number (80h = first, 81h = second)
 ES:BX -> data buffer
Return: CF clear if successful
 CF set on error
 AH = status (see #00234)
 AL = number of sectors transferred
Notes: each sector's worth of data must be followed by four to seven bytes of
   error-correction information
 used for diagnostics only on PS/2 systems; IBM officially classifies
   this function as optional
SeeAlso: AH=03h,AH=0Ah,MEM 0040h:0074h
--------B-130C-------------------------------
INT 13 - HARD DISK - SEEK TO CYLINDER
 AH = 0Ch
 CH = low eight bits of cylinder number
 CL = sector number (bits 5-0)
     high two bits of cylinder number (bits 7-6)
 DH = head number
 DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234)
SeeAlso: AH=00h,AH=02h,AH=0Ah,AH=47h
--------B-130D-------------------------------
INT 13 - HARD DISK - RESET HARD DISKS
 AH = 0Dh
 DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234)
Notes: reinitializes the hard disk controller, resets the specified drive's
   parameters, and recalibrates the drive's heads (seek to track 0)
 for PS/2 35SX, 35LS, 40SX and L40SX, as well as many other systems,
   both the master drive and the slave drive respond to the Reset
   function that is issued to either drive
 not for PS/2 ESDI drives
SeeAlso: AH=00h,INT 21/AH=0Dh
--------B-130E-------------------------------
INT 13 - HARD DISK - READ SECTOR BUFFER (XT only)
 AH = 0Eh
 DL = drive number (80h = first, 81h = second hard disk)
 ES:BX -> buffer
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234)
Notes: transfers controller's sector buffer.  No data is read from the drive
 used for diagnostics only on PS/2 systems
SeeAlso: AH=0Ah
--------B-130F-------------------------------
INT 13 - HARD DISK - WRITE SECTOR BUFFER (XT only)
 AH = 0Fh
 DL = drive number (80h = first, 81h = second hard disk)
 ES:BX -> buffer
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234)
Notes: does not write data to the drive
 should be called before formatting to initialize an XT-type
   controller's sector buffer
 used for diagnostics only on PS/2 systems
SeeAlso: AH=0Bh
--------B-1310-------------------------------
INT 13 - HARD DISK - CHECK IF DRIVE READY
 AH = 10h
 DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
SeeAlso: AH=11h
--------B-1311-------------------------------
INT 13 - HARD DISK - RECALIBRATE DRIVE
 AH = 11h
 DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
Note: causes hard disk controller to seek the specified drive to cylinder 0
SeeAlso: AH=00h,AH=0Ch,AH=10h,AH=19h"FIXED DISK",MEM 0040h:003Eh
--------B-1312-------------------------------
INT 13 - HARD DISK - CONTROLLER RAM DIAGNOSTIC (XT,PS)
 AH = 12h
 DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234 at AH=01h)
 AL = 00h
SeeAlso: AH=13h,AH=14h
--------d-1312-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - STOP SCSI DISK
 AH = 12h
 DL = hard drive ID
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234 at AH=01h)
Notes: available at least on the TMC-870 8-bit SCSI controller BIOS v6.0A
 if the given drive is a SCSI device, the SCSI Stop Unit command is sent
   and either "Disk prepared for shipping" or "Disk Stop command failed"
   is displayed
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
--------d-1312-------------------------------
INT 13 - SyQuest - START/STOP SCSI DISK
 AH = 12h
 AL = subfunction
     00h start disk
     01h stop disk
 CX = wait flag
     00h wait for ready
     01h don't wait for ready
 DL = hard drive ID (bit 7 for hard disks must be set)
Return: CF set on error
 CF clear if successful
 AH = status
     00h successful
     01h invalid function request
     80h timeout
SeeAlso: AH=12h"Future Domain",AH=13h"SyQuest"
--------B-1313-------------------------------
INT 13 - HARD DISK - DRIVE DIAGNOSTIC (XT,PS)
 AH = 13h
 DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234 at AH=01h)
 AL = 00h
SeeAlso: AH=12h"HARD DISK",AH=14h"HARD DISK"
--------d-1313-------------------------------
INT 13 - SyQuest - READ DRIVE PARAMATERS (for DOS 5+)
 AH = 13h
 DL = drive ID (bit 7 set for hard disks)
Return: CF set on error
     AH = status (07h) (see #00234 at AH=01h)
 CF clear if successful
     AH = 00h
     BL = drive type (AT/PS2 floppies only) (see #00242)
     CH = low eight bits of maximum cylinder number
     CL = maximum sector number (bits 5-0)
   high two bits of maximum cylinder number (bits 7-6)
     DH = maximum head number
     DL = number of drives
     ES:DI -> drive parameter table (floppies only)
Notes: the return values are identical to the standard INT 13/AH=08h, but the
   number of drives is not limited to 2, so
 scanning all possible drive numbers with the Read DASD Type call
   (AH=15h) should generally be preferred to determine the number of
   drives attached to the system.
SeeAlso: AH=08h"PC",AH=12h"SyQuest",AH=15h,AH=59h"SyQuest"
--------B-1314-------------------------------
INT 13 - HARD DISK - CONTROLLER INTERNAL DIAGNOSTIC
 AH = 14h
Return: CF set on error
 CF clear if successful
 AH = status code (see #00234 at AH=01h)
 AL = 00h
SeeAlso: AH=12h,AH=13h
--------B-1315-------------------------------
INT 13 - DISK - GET DISK TYPE (XT 1986/1/10 or later,XT286,AT,PS)
 AH = 15h
 DL = drive number (bit 7 set for hard disk)
 (AL = FFh, CX = FFFFh, see Note)
Return: CF clear if successful
     AH = type code
  00h no such drive
      (SpeedStor) AL = 03h hard disk
        CX:DX = number of 512-byte sectors
  01h floppy without change-line support
  02h floppy (or other removable drive) with change-line support
  03h hard disk
      CX:DX = number of 512-byte sectors
 CF set on error
     AH = status (see #00234 at AH=01h)
Note: SyQuest can report type 01h or 02h for 'hard disks', since its media
   is removable
BUGS: many versions of the Award 486 BIOS do not return the sector count
   because the BIOS exit code restores CX and DX to their original
   values after the function had already set them to correct values
 Some releases of PC Tools REBUILD preset CX=FFFFh and only trust the
   results if CH <= 2 on return (which would cut off drives > 16 Gb).
 several different Compaq BIOSes incorrectly report high-numbered
   drives (such as 90h, B0h, D0h, and F0h) as present, giving them the
   same geometry as drive 80h; as a workaround, scan through disk
   numbers, stopping as soon as the number of valid drives encountered
   equals the value in 0040h:0075h
 the PS/2 Model 30 fails to reset the bus after INT 13/AH=08h and
   INT 13/AH=15h.  A workaround is to monitor for these functions
   and perform a transparent INT 13/AH=01h status read afterwards.
   This will reset the bus. The MS-DOS 6.0 IO.SYS takes care of
   this by installing a special INT 13h interceptor for this purpose.
 Some releases of SpeedStor have a bug where it reports AX=0003h instead
   of correctly reporting AH=03h for hard disks. A possible workaround
   when testing for hard disks is to check for AH=03h and AX=0003h.
   In this case this function should be invoked with a bogus fixed
   value in AL, e.g. AL=FFh.
SeeAlso: AH=08h,AH=16h,AH=17h,AH=19h"SCSI",MEM 0040h:0075h
--------B-1316-------------------------------
INT 13 - FLOPPY DISK - DETECT DISK CHANGE (XT 1986/1/10 or later,XT286,AT,PS)
 AH = 16h
 DL = drive number (00h-7Fh)
 SI = 0000h (to avoid crash on AT&T 6300)
Return: CF clear if change line inactive
     AH = 00h (disk not changed)
 CF set if change line active
     AH = status
  01h invalid command (SyQuest)
  06h change line active or not supported
  80h drive not ready or not present
Notes: call AH=15h first to determine whether the drive supports a change
   line
 this call also clears the media-change status, so that a disk change
   is only reported once
BUGS: some versions of Award 386 Modular BIOS and AMI BIOS fail to clear
   the media-change status
 AT&T 6300 WGS systems crash if SI <> 0 on entry.
 some pre 1986/08/04 Compaq ROM BIOS have a serious bug where this
   function may re-configure a hard disk depending on what is located
   at ES:[BX] and data indexed to by it. MS-DOS/PC DOS IO.SYS/IBMBIO.COM
   install a special filter when they detect Compaq ROM BIOSes with
   earlier dates.
 some Compaq 286 systems have a bug in all INT 13h functions >= 16h,
   which causes the byte at DS:0074h to be destroyed when called for
   hard disks (DL >= 80h). MS-DOS/PC DOS IO.SYS/IBMBIO.COM performs a
   test on this bug using this sub-function, and if found installs a
   special filter which points DS into ROM, so that it cannot cause
   any harm.
 some drives (or controllers???) forget the change line status
   if another drive is accessed afterwards. The DOS BIOS takes care
   of this by not relying on the reported change line status when
   the change line is not active and a different drive is accessed,
   instead it reports "don't know" to the DOS kernel.
SeeAlso: AH=15h,AH=49h
--------B-1317-------------------------------
INT 13 - FLOPPY DISK - SET DISK TYPE FOR FORMAT (AT,PS)
 AH = 17h
 AL = format type
     01h = 320/360K disk in 360K drive
     02h = 320/360K disk in 1.2M drive
     03h = 1.2M disk in 1.2M drive
     04h = 720K disk in 720K or 1.44M drive
 DL = drive number
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
Note: this function does not handle 1.44M drives; use AH=18h instead
SeeAlso: AH=15h,AH=18h
--------d-131700-----------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET INQUIRY INFO FROM SCSI DEVICE
 AX = 1700h
 CL = length of buffer
 DL = hard drive ID
 ES:BX -> buffer for info (see #00243)
Return: CF clear if successful
     CH = number of bytes returned in buffer???
 CF set on error
     AH = status code (see #00234 at AH=01h)
Notes: this function is not available with 8-bit controller ROM versions < 7.0
 information block bytes 5-n are vendor-specific in older SCSI devices
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=18h"SCSI",AH=1Bh"SCSI"

Format of Future Domain SCSI inquiry information block:
Offset Size Description (Table 00243)
 00h BYTE device type
  bits 0-4: peripheral device type (see #00244)
  bits 5-7: peripheral qualifier (see #00245)
 01h BYTE device type modifier
  bits 0-6: device type modifier
  bit 7: removable medium
 02h BYTE SCSI version (see #00246)
 03h BYTE data format/capabilities (see #00247)
 04h BYTE additional data length (total remaining bytes)
 05h  2 BYTEs reserved
 07h BYTE device capabilities (see #00248)
 08h  8 BYTEs vendor identification (space-padded ASCII)
 10h  8 BYTEs product identification (space-padded ASCII)
 20h  4 BYTEs product revision level (space-padded ASCII)
 24h 20 BYTEs vendor specific
 38h 40 BYTEs reserved
 60h var vendor specific parameters

(Table 00244)
Values for Future Domain SCSI peripheral device type:
 00h direct-access device (e.g., magnetic disk)
 01h sequential-access device (e.g., magnetic tape)
 02h printer device
 03h processor device
 04h write-once device (e.g., some optical disks)
 05h CD-ROM device
 06h scanner device
 07h optical memory device (e.g., some optical disks)
 08h medium changer device (e.g., jukeboxes)
 09h communications device
 0Ah (defined by ASC IT8)
 0Bh (defined by ASC IT8)
 0Ch-1Eh reserved
 1Fh unknown or no device type

(Table 00245)
Values for Future Domain SCSI peripheral qualifier:
 000b device is currently connected to this logical unit and available
 001b target is capable of supporting the specified peripheral, but the
   physical device is not currently connected to this logical unit
 010b reserved
 011b target can't support a physical device on this logical unit
 1xxb vendor specific

Bitfields for Future Domain SCSI version:
Bit(s) Description (Table 00246)
 0-2 ANSI-approved version
 000 device might or might not comply to ANSI standard
 001 device complies to ANSI SCSI-1
 010 device complies to ANSI SCSI-2
 other reserved
 3-5 ECMA version
 6-7 ISO version

Bitfields for Future Domain SCSI data format/capabilities:
Bit(s) Description (Table 00247)
 0-2 response data format
 000 information block is as specified in SCSI-1
 001 information block is as specified in CCS
 010 information block is as specified in SCSI-2
 other reserved
 4-5 reserved
 6 terminate I/O process supported
 7 asynchronous event notification supported

Bitfields for Future Domain SCSI device capabilities:
Bit(s) Description (Table 00248)
 0 device responds to RESET with a hard RESET
 1 tagged command queuing supported
 2 reserved
 3 linked commands supported
 4 synchronous data transfer supported
 5 16-transfers supported
 6 32-transfers supported
 7 relative addressing supported
--------B-1318-------------------------------
INT 13 - DISK - SET MEDIA TYPE FOR FORMAT (AT model 3x9,XT2,XT286,PS)
 AH = 18h
 DL = drive number
 CH = lower 8 bits of highest cylinder number (number of cylinders - 1)
 CL = sectors per track (bits 0-5)
      top 2 bits of highest cylinder number (bits 6,7)
Return: AH = status
     00h requested combination supported
     01h function not available
     0Ch not supported or drive type unknown
     80h there is no disk in the drive
 ES:DI -> 11-byte parameter table (see #01264 at INT 1E)
Note: this function does not set the INT 1E vector to point at the returned
   parameter table; it is the caller's responsibility to do so
SeeAlso: AH=05h,AH=07h,AH=17h,INT 1E
--------d-1318-------------------------------
INT 13 - Future Domain SCSI BIOS - GET SCSI CONTROLLER INFORMATION
 AH = 18h
 DL = hard drive ID
Return: CF set on error
     AH = status code (see #00234 at AH=01h)
 CF clear if successful
     AX = 4321h (magic number)
     CX = controller family code (see #00249)
     ---if family code=0200h
  DH = number of exclusively ROM-controlled SCSI devices
  DL = canonical SCSI device number for specified drive
     ---if family code <> 0200h
  BH = number of exclusively ROM-controlled SCSI devices
  BL = canonical SCSI device number for specified drive
Notes: also sets an internal flag (non-resettable) which prevents some
   controller messages from being displayed, allows writes to
   removable devices (use caution!), and enables the INT 13 interface
   for more than one drive (i.e. DL >= 81h) in at least some ROM
   versions
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=05h"SCSI",AX=1700h"SCSI",AH=1Bh"SCSI",INT 4F/AX=8100h

(Table 00249)
Values for Future Domain SCSI controller family code:
 0200h TMC-1680/? (ROM 3.0)
 0203h TMC-1650/1660/1670/1680 (ROM 2.0)
 040Ah TMC-820/830/840/850/860/870/875/880/885 (ROM <= 6.0A)
 050Dh TMC-840/841/880/881 (ROM 5.2D)
 0700h TMC-830/850/860/875/885 (ROM 7.0)
--------d-1318--CX5055-----------------------
INT 13 - PU_1700.COM - INSTALLATION CHECK
 AH = 18h
 CX = 5055h ('PU')
 DL = 00h
Return: AX = 7570h ('up') if PU_1700 is installed
Program: PU_1700 is a BIOS enhancer from PU Service Systems which permits
   formatting diskettes at higher capacity (1.78M instead of 1.44M)
SeeAlso: AX=057Fh/SI=324Dh"2M"
--------d-1318--CXD2C9-----------------------
INT 13 - XDF.COM - API
 AH = 18h
 CX = D2C9h ("R"+80h, "I"+80h = Roger Ivey)
 DX = 0000h
 BX = function
     0000h installation check
    Return: AH = 0Ch
     CX = 7269h ("ri" = Roger Ivey)
     ES = segment of driver
     CF set
     2F64h ("/d") disable the driver
    Return: AH = 0Ch
     ES:BX = pointer to activation flag (it is set to 0:
      set it to 1 to enable the driver again)
     CX = 7269h
     CF set
     2F75h ("/u") unload the driver (restore interrupts & free memory)
    Return: AH = 0Ch
     DL = 55h ("U") if successful
        = 00h    if fails
     CX = 7269h
     ES = segment of driver
     CF set
     AL, BX, DH, and DI destroyed
Program: XDF is a TSR provided with PC-DOS 7.0 to support XDF 1.84M disks,
   developed by Roger D. Ivey
Note: After disabling or enabling the driver, a disk change must be performed
   or simulated to reset the driver.
--------B-1319-------------------------------
INT 13 - FIXED DISK - PARK HEADS ON ESDI DRIVE (XT286,PS)
 AH = 19h
 DL = drive
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
SeeAlso: AH=11h
--------d-1319-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - REINITIALIZE DRIVE
 AH = 19h
 DL = hard drive ID
Return: CF set on error
     AH = status code (see #00234 at AH=01h)
 CF clear if successful
     AH = disk type (03h = fixed disk)
     CX:DX = number of 512-byte sectors
Notes: sends SCSI Read Capacity command to get number of logical blocks and
   adjusts the result for 512-byte sectors
 displays either "Error in Read Capacity Command" or "nnn Bytes per
   sector" (nnn=256 or 512, the only sizes supported in the translation
   code)
 should probably be called when a removable device has its media changed
 returns the same values as AH=15h
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=15h,AH=1Ah,INT 4F/AX=8100h
--------d-131A-------------------------------
INT 13 - ESDI FIXED DISK - FORMAT UNIT (PS)
 AH = 1Ah
 AL = defect table entry count
 CL = format modifiers (see #00250)
 DL = drive (80h,81h)
 ES:BX -> defect table (see #00251), ignored if AL=00h
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
Note: if periodic interrupt selected, INT 15/AH=0Fh is called after each
   cylinder is formatted
SeeAlso: AH=07h,INT 15/AH=0Fh

Bitfields for ESDI format modifiers:
Bit(s) Description (Table 00250)
 4 generate periodic interrupt
 3 perform surface analysis
 2 update secondary defect map
 1 ignore secondary defect map
 0 ignore primary defect map

Format of defect table entry [array]:
Offset Size Description (Table 00251)
 00h  3 BYTEs relative sector address (little-endian)
 03h BYTE flags and defect count
  bit 7: last logical sector on track
  bit 6: first logical sector on track
  bit 5: last logical sector on cylinder
  bit 4: logical sectors are pushed onto next track
  bits 3-0: number of defects pushed from previous cylinder
--------d-131A-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET SCSI PARTIAL MEDIUM CAPACITY
 AH = 1Ah
 CH = track (bits 8,9 in high bits of CL)
 CL = sector (01h to number of sectors/track for drive)
 DH = head
 DL = hard drive ID
Return: CF set on error
 AH = status code (see #00234 at AH=01h)
 CX:DX = logical block number of last quickly-accessible block after
  given block
Notes: sends SCSI Read Capacity command with the PMI bit set to obtain the
   logical block address of the last block after which a substantial
   delay in data transfer will be encountered (usually the last block
   on the current cylinder).  No translation to 512 byte sectors is
   performed on the result if data is stored on the disk in other than
   512 byte sectors.
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=15h,AH=19h"SCSI"
--------d-131B-------------------------------
INT 13 - ESDI FIXED DISK - GET MANUFACTURING HEADER
 AH = 1Bh
 AL = number of sectors to read
 DL = drive
 ES:BX -> buffer for manufacturing header (defect list)
Return: CF set on error
 CF clear if successful
 AH = status
Note: manufacturing header format (Defect Map Record format) can be found
   in IBM 70MB, 115MB Fixed Disk Drives Technical Reference
 the first sector read contains the manufacturing header with the number
   of defect entries and the beginning of the defect map; the remaining
   sectors contain the remainder of the defect map
--------d-131B-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET POINTER TO SCSI DISK INFO BLOCK
 AH = 1Bh
 DL = hard drive ID
Return: CF set on error
     AH = status code (see #00234 at AH=01h)
 CF clear if successful
     ES:BX -> SCSI disk information block (see #00252)
Notes: also sets a non-resettable flag which prevents some controller messages
   from being displayed
 the TMC-950 does not support any Future Domain BIOS calls; instead,
   it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=18h"SCSI",AH=1Ch"SCSI"

Format of Future Domain SCSI disk information block:
Offset Size Description (Table 00252)
 00h BYTE drive physical information (see #00253)
 01h WORD translated number of cylinders
 03h BYTE translated number of heads
 04h BYTE translated number of sectors per track (17, 34, or 63)
 05h BYTE drive address
  bits 0-2: logical unit number
  bits 3-5: device number
 06h BYTE 01h at initialization
 07h BYTE sense code byte 00h, or extended sense code byte 0Ch
 08h BYTE 00h
 09h BYTE 00h or extended sense code byte 02h (sense key)
 0Ah BYTE 00h
 0Bh 10 BYTEs copy of Command Descriptor Block (CDB) (see #03236,#03237)
 15h DWORD translated number of sectors on device

Bitfields for Future Domain SCSI device physical information:
Bit(s) Description (Table 00253)
 0 ???
 1 device uses parity
 2 256 bytes per sector instead of 512
 3 don't have capacity yet???
 4 disk is removable
 5 logical unit number is not present
--------d-131C-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET POINTER TO FREE CONTROLLER RAM
 AH = 1Ch
 DL = hard drive ID (any valid SCSI hard disk)
Return: CF set on error
     AH = status code (see #00234 at AH=01h)
 CF clear if successful
     ES:BX -> first byte of free RAM on controller
Notes: the Future Domain TMC-870 contains 1024 bytes of RAM at offsets 1800h
   to 1BFFh on-board the controller for storing drive information and
   controller status; ES:BX points to the first byte available for other
   uses
 ES contains the segment at which the controller resides; the
   controller's two memory-mapped I/O ports are at offsets 1C00h, 1E00h
SeeAlso: AH=1Bh"SCSI"
--------d-131C-------------------------------
INT 13 U - ESDI FIXED DISK - ???
 AH = 1Ch
 AL = subfunction (01h-06h)
 DL = drive (80h,81h)
 ???
Return: ???
Note: these functions perform a controller command 0612h without DMA
SeeAlso: AX=1C08h,PORT 3510h"ESDI"
--------d-131C08-----------------------------
INT 13 U - ESDI FIXED DISK - GET COMMAND COMPLETION STATUS
 AX = 1C08h
 DL = drive (80h,81h)
 ES:BX -> buffer for Command Complete Status Block (see #00254)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
SeeAlso: AX=1C09h,AX=1C0Ah,PORT 3510h"ESDI"

Format of ESDI Command Complete Status Block:
Offset Size Description (Table 00254)
 00h BYTE 07h
 01h BYTE size of block in words (07h)
 02h BYTE command error code (see #00255)
 03h BYTE command status code (see #00256)
 04h BYTE device error code, group 1 (see #00257)
 05h BYTE device error flags, group 2 (see #00258)
 06h WORD number of unprocessed sectors due to abnormal termination
 08h DWORD last Relative Sector Address processed by command
 0Ch WORD number of sectors corrected by ECC codes

(Table 00255)
Values for ESDI command error code:
 00h successful
 01h parameter invalid
 02h unknown function
 03h unsupported command
 04h command cancelled
 05h unknown function
 06h controller diagnostics failed
 07h formatting failed
 08h format error in primary map
 09h format error in secondary map
 0Ah diagnostic failure during formatting
 0Bh warning: secondary map too large during formatting
 0Ch warning: non-zero defect
 0Dh system checksum error during formatting
 0Eh warning: incompatible device
 0Fh warning: push table overflowed
 10h warning: more than 15 sectors pushed to next cylinder
 11h internal hardware error
 12h warning: errors found while verifying sectors
 13h invalid device
 FFh device error

(Table 00256)
Values for ESDI command status code:
 01h successful
 03h successful after ECC
 05h successful after retries
 06h format partially completed
 07h successful after ECC and retries
 08h command completed with warning (see #00255)
 09h abort complete
 0Ah reset complete
 0Bh data transfer ready (no status block)
 0Ch command completed with failure (see #00257,#00258)
 0Dh DMA error
 0Eh command block error (see #00255)
 0Fh bad attention code
SeeAlso: #00257

(Table 00257)
Values for ESDI device error code, group 1:
 00h successful
 01h seek fault detected by device
 02h interface fault
 03h sector ID not found
 04h disk not formatted
 05h unrecoverable ECC error
 06h ECC error in sector ID
 07h invalid relative sector address
 08h timeout
 09h sector defective
 0Ah disk changed (removable media)
 0Bh selection error
 0Ch write protected (removable media)
 0Dh write fault
 0Eh read fault
 0Fh no index or sector pulse
 10h device not ready
 11h seek error detected by adapter
 12h bad format
 13h volume overflow
 14h data address mark not found
 15h sector ID not found
 16h missing device configuration data
 17h first/last relative sector flags missing
 18h track empty
 81h timeout while waiting for stop
 82h timeout while waiting for end of data transfer
 84h stopped awaiting data transfer during formatting
 85h timeout while waiting for head switch
 86h timeout while awaiting DMA completion
SeeAlso: #00256,#00258

Bitfields for ESDI device error flags, group 2:
Bit(s) Description (Table 00258)
 7-5 unused
 4 ready
 3 selected
 2 write fault
 1 on track 0
 0 seek/command complete
SeeAlso: #00257
--------d-131C09-----------------------------
INT 13 U - ESDI FIXED DISK - GET DEVICE STATUS
 AX = 1C09h
 DL = drive (80h,81h)
 ES:BX -> buffer for Device Status Block (see #00259)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
SeeAlso: AX=1C08h,AX=1C0Ah,PORT 3510h"ESDI"

Format of ESDI Device Status Block:
Offset Size Description (Table 00259)
 00h BYTE 08h
 01h BYTE number of words in block (09h)
 02h BYTE error flags
 03h BYTE unused
 04h BYTE command error code (see #00255)
 05h BYTE command status code (see #00256)
 06h WORD ESDI standard status
 08h  5 WORDs ESDI vendor-specific status codes
--------d-131C0A-----------------------------
INT 13 U - ESDI FIXED DISK - GET DEVICE CONFIGURATION
 AX = 1C0Ah
 DL = drive (80h,81h)
 ES:BX -> buffer for Drive Configuration Status Block (see #00260)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
Note: device configuration format can be found in IBM ESDI Fixed Disk Drive
   Adapter/A Technical Reference
SeeAlso: AX=1C08h,AX=1C0Bh,AX=1C0Ch

Format of ESDI Drive Configuration Status Block:
Offset Size Description (Table 00260)
 00h BYTE 09h
 01h BYTE number of words in block (06h)
 02h BYTE flags
 03h BYTE number of spare sectors per cylinder
 04h DWORD total number of usable sectors
 08h WORD total number of cylinders
 0Ah BYTE tracks per cylinder
 0Bh BYTE sectors per track
--------d-131C0B-----------------------------
INT 13 U - ESDI FIXED DISK - GET ADAPTER CONFIGURATION
 AX = 1C0Bh
 ES:BX -> buffer for Controller Configuration Status Block (see #00261)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
SeeAlso: AX=1C0Ch

Format of ESDI Controller Configuration Status Block:
Offset Size Description (Table 00261)
 00h BYTE E9h
 01h BYTE number of words in block (06h)
 02h WORD unused (0000h)
 04h DWORD controller microcode revision level
 08h  2 WORDs unused (0000h)
--------d-131C0C-----------------------------
INT 13 U - ESDI FIXED DISK - GET POS INFORMATION
 AX = 1C0Ch
 ES:BX -> buffer for POS Information Status Block (see #00262)
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
SeeAlso: AX=1C0Bh

Format of ESDI POS Information Status Block:
Offset Size Description (Table 00262)
 00h BYTE EAh
 01h BYTE number of words in block (05h)
 02h WORD magic value FFDDh
 04h BYTE POS register 3
 05h BYTE POS register 2
 06h BYTE POS register 5 (unused, FFh)
 07h BYTE POS register 4 (unused, FFh)
 08h BYTE POS register 7 (unused, FFh)
 09h BYTE POS register 6 (unused, FFh)
--------d-131C0D-----------------------------
INT 13 U - ESDI FIXED DISK - ???
 AX = 1C0Dh
 DL = drive (80h,81h)
 ???
Return: ???
Note: invokes controller command 0614h without DMA
SeeAlso: AH=1Ch"ESDI",AX=1C0Fh,PORT 3510h"ESDI"
--------d-131C0E-----------------------------
INT 13 U - ESDI FIXED DISK - TRANSLATE RBA TO ABA
 AX = 1C0Eh
 CH = low 8 bits of cylinder number
 CL = sector number, high two bits of cylinder number in bits 6 and 7
 DH = head number
 DL = drive number (80h,81h)
 ES:BX -> ABA number
Return: CF set on error
 CF clear if successful
 AH = status (see #00234 at AH=01h)
Note: ABA (absolute block address) format can be found in IBM ESDI Adapter
   Technical Reference by using its Device Configuration Status Block
SeeAlso: AX=1C08h,AX=1C0Fh,PORT 3510h"ESDI"
--------d-131C0F-----------------------------
INT 13 U - ESDI FIXED DISK - ???
 AX = 1C0Fh
 DL = drive (80h,81h)
 ???
Return: ???
Note: invokes controller command 0614h without DMA
SeeAlso: AH=1Ch"ESDI",AX=1C0Dh,AX=1C12h,PORT 3510h"ESDI"
--------d-131C12-----------------------------
INT 13 U - ESDI FIXED DISK - ???
 AX = 1C12h
 DL = drive (80h,81h)
 ???
Return: ???
Note: invokes controller command 0612h without DMA
SeeAlso: AH=1Ch"ESDI",AX=1C0Fh,PORT 3510h"ESDI"
--------c-131D-------------------------------
INT 13 - IBMCACHE.SYS - CACHE STATUS
 AH = 1Dh
 AL = subfunction
     01h get status record
  DL = drive???
  Return: ES:BX -> status record (see #00263)
   CF set on error
       AH = error code
     02h set cache status
  ES:BX -> status record (see #00263)
  DL = drive???
  Return: CF set on error

Format of IBMCACHE.SYS status record:
Offset Size Description (Table 00263)
 00h DWORD total number of read requests
 04h DWORD total number of hits
 08h DWORD number of physical disk reads
 0Ch DWORD total number of sectors requested by physical disk reads
 10h  6 BYTEs ???
 16h DWORD pointer to start of error list (see #00264)
 1Ah DWORD pointer to end of error list
 1Eh WORD ???
 20h BYTE using extended memory if nonzero
 21h BYTE ???
 22h  4 BYTEs ASCII version number
 26h WORD cache size in KB
 28h WORD sectors per page

Format of IBMCACHE.SYS error list:
Offset Size Description (Table 00264)
 00h DWORD relative block address of bad page
 04h BYTE drive
 05h BYTE sector bit-map
 06h WORD next error
--------d-131F-------------------------------
INT 13 - SyQuest - DOOR LATCH/DOOR BUTTON DETECT
 AH = 1Fh
 AL = subfunction
     00h allow media removal
     01h prevent media removal (lock door)
 DL = drive ID (bit 7 set for hard disks)
Return: CF clear if successful
     AH = 00h
 CF set on error
     AH = error code
  00h successful
  01h invalid function request
  80h timeout
  DDh media change requested
SeeAlso: AH=12h"SyQuest",AH=13h"SyQuest",AH=59h"SyQuest"
--------d-1320-------------------------------
INT 13 - DISK - ??? (Western Digital "Super BIOS")
 AH = 20h
 ???
Return: ???
Notes: returns some kind of status related to whether the drive contains its
   default media type
 QEMM v6.00 calls INT 13/AX=2000h/DL=81h in some cases
--------b-1320-------------------------------
INT 13 U - Compaq, ATAPI Removable Media Device - GET CURRENT MEDIA FORMAT
 AH = 20h
 DL = drive number (00h,01h)
Return: CF clear if successful
     AL = media type (see #00265)
     AH = 00h
 CF set on error
     AH = error code
  01h invalid request
  30h drive does not support media sense
  31h no such drive / media not present
  32h non-default media / drive does not support media type
Notes: this function is supported by the 1993/3/8 Compaq ROM BIOS, but only
   partially (AL is always 00h when successful) by the 1993/8/3 version
 this function is also supported by some recent versions of the Phoenix
   486 BIOS
 this function does not seem to be supported by some Toshiba BIOSes
   (at least before 1995, maybe some laptops??? with 1.44 MB floppies),
   because S/DOS 1.0 contains code to bypass a call to this function,
   always assuming the drive would not support media sense.
SeeAlso: AH=15h

(Table 00265)
Values for Compaq/ATAPI diskette media type:
 03h 720K  (1M unformatted)
 04h 1.44M (2M unformatted)
 06h 2.88M (4M unformatted)
 0Ch 360K
 0Dh 1.2M
 0Eh Toshiba 3mode
 0Fh NEC 3mode (1024-byte sectors)
 10h ATAPI Removable Media Device
--------c-1320-------------------------------
INT 13 u - QUICKCACHE II v4.20 - DISMOUNT
 AH = 20h
 AL = drive (00h = A:, etc. or 7Fh for all removable drives???
       or FFh for all drives)
Return: AX = status (0000h successful)
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
   Associates, Inc.
Desc: flush any dirty buffers for the specified drive(s) and then discard
   those sector buffers
SeeAlso: AH=21h"QUICKCACHE",AH=22h"QUICKCACHE",AH=28h
--------d-1321-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - READ MULTIPLE DISK SECTORS
 AH = 21h
 AL = number of sectors to write
 CH = low byte of 12-bit cylinder number
 CL = starting sector (bits 0-5) and bits 8-9 of cylinder (bits 6-7)
 DH = head number (bits 0-5) and bits 10-11 of cylinder (bits 6-7)
 DL = drive number (80h,81h)
 ES:BX -> buffer for data to be read
Return: CF clear if successful
     ES:BX buffer filled
 CF set on error
 AH = status (see #00234 at AH=01h)
Desc: read from the disk using the Multiple Block mode available on newer
   IDE drives and some hard disk controllers, which generates an
   interrupt only after the end of transferring a group of sectors
   rather than after each sector
Notes: must call AH=24h"PS/1" before using this function
 input values in CL and DH are not range-checked
 the byte at address 0040h:0074h is set to the status of the operation
SeeAlso: AH=02h,AH=22h"PS/1",AH=23h"PS/1",AH=24h"PS/1"
--------c-1321-------------------------------
INT 13 u - QUICKCACHE II v4.20 - FLUSH CACHE
 AH = 21h
Return: AX = status (0000h successful)
Desc: immediately write all dirty sectors back to disk
Note: this is one out of several cache flush calls issued by the PTS-DOS 6.51
   and S/DOS 1.0 kernel before rebooting. It is called with DL=80h and
   conflicts with the PS/2 function of the same function number, because
   the kernel does not perform Quickcache's installation check first.
SeeAlso: AH=25h"QUICKCACHE",AH=2Eh,AH=2Fh
--------d-1322-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - WRITE MULTIPLE DISK SECTORS
 AH = 22h
 AL = number of sectors to write
 CH = low byte of 12-bit cylinder number
 CL = starting sector (bits 0-5) and bits 8-9 of cylinder (bits 6-7)
 DH = head number (bits 0-5) and bits 10-11 of cylinder (bits 6-7)
 DL = drive number (80h,81h)
 ES:BX -> buffer containing data to be written
Return: CF clear if successful
 CF set on error
 AH = status (see #00234 at AH=01h)
Desc: write to the disk using the Multiple Block mode available on newer
   IDE drives and some hard disk controllers, which generates an
   interrupt only after the end of transferring a group of sectors
   rather than after each sector
Notes: must call AH=24h"PS/1" before using this function
 input values in CL and DH are not range-checked
 the byte at address 0040h:0074h is set to the status of the operation
SeeAlso: AH=03h,AH=21h"PS/1",AH=23h"PS/1",AH=24h"PS/1"
--------c-1322-------------------------------
INT 13 u - QUICKCACHE II v4.20 - ENABLE/DISABLE CACHE
 AH = 22h
 AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
Note: enables/disables caching of all drives
SeeAlso: AH=2Ch,AH=2Dh,AH=32h,AH=33h,AH=A3h,AH=A4h
--------d-1323-------------------------------
INT 13 U - HARD DISK - PS/1 and newer PS/2 - SET CONTROLLER FEATURES REGISTER
 AH = 23h
 AL = feature number (see #00266)
 DL = drive number (80h,81h)
 ???
Return: CF clear if successful
 CF set on error
 AH = status (see #00234 at AH=01h)
SeeAlso: AH=21h"PS/1",AH=22h"PS/1",AH=24h"PS/1",AH=25h"PS/1"

(Table 00266)
Values for PS/1 hard disk feature number:
 01h select 8-bit data transfers instead of 16-bit
 02h enable write cache
 22h Write Same, user-specified area
 33h disable retries
 44h set number of ECC bytes for read long/write long (see AH=0Ah,AH=0Bh)
 54h set cache segments
 55h disable lookahead
 66h disable reverting to power-on defaults
 77h disable error correctioni
 81h select 16-bit data transfers (default)
 82h disable write cache
 88h enable error correction (default)
 99h enable retries (default)
 AAh enable lookahead
 BBh set ECC length for read long/write long to four bytes
 CCh enable reverting to power-on defaults
 DDh Write Same, entire disk
SeeAlso: #P0535
--------c-1323-------------------------------
INT 13 U - QUICKCACHE II v4.20 - GET ??? ADDRESS
 AH = 23h
Return: AX = status (0000h successful)
 ES = segment of ??? data
--------d-1324-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - SET MULTIPLE MODE
 AH = 24h
 AL = number of sectors per block (2,4,8,16)
 DL = drive number (80h,81h)
Return: CF clear if successful
 CF set onerror
 AH = status (see #00234 at AH=01h)
Desc: specify how many sectors the controller should transfer as a group
   between operation-complete interrupts when using the Read Multiple
   and Write Multiple functions (AH=21h,AH=22h)
Notes: set the number of sectors to 0 to disable multiple-transfer mode
 the maximum value for the block size depends on the fixed disk
   drive type.  The value is stored in byte 15h of the fixed disk
   drive parameter table that is created by POST.
 the byte at address 0040h:0074h is set to status of operation.
SeeAlso: AH=21h"PS/1",AH=22h"PS/1",AH=23h"PS/1",AH=25h"PS/1"
--------c-1324-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET SECTORS
 AH = 24h
 BX = new number of sector buffers in cache
Return: AX = status
     0000h successful
     0001h failed--size adjusted
     8000h cache cannot be resized while enabled
SeeAlso: AH=36h
--------d-1325-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - IDENTIFY DRIVE
 AH = 25h
 DL = drive number (80h,81h)
 ES:BX-> 512 byte buffer for reply packet
Return: CF clear if successful
 CF set on error
 AH = status (see #00234 at AH=01h)
 buffer filled with ATA/IDE-style drive information block (see #00267)
Desc: retrieves the 256 words of drive data stored on an IDE hard disk
Notes: the byte at address 0040h:0074h is set to the status of the operation
 IBM officially classifies this function as optional
SeeAlso: AH=23h"PS/1"

Format of drive information block:
Offset Size Description (Table 00267)
 00h WORD general drive configuration (see #00268)
 02h WORD number of cylinders
 04h WORD reserved
 06h WORD number of heads
 08h WORD number of unformatted bytes per track
 0Ah WORD number of unformatted bytes per sector
 0Ch WORD number of sectors per track
 0Eh  6 BYTEs vendor unique
 14h 20 BYTEs serial number in ASCII, 0000h=not specified)
 28h WORD buffer type
 2Ah WORD buffer size in 512 byte increments (0000h=not specified)
 2Ch WORD number of ECC bytes passed on Read/Write Long cmds
  0000h = not specified
 2Eh  8 BYTEs firmware revision in ASCII, 0000h=not specified
 36h 40 BYTEs model number in ASCII, 0000h=not specified
 5Eh WORD bits 15-8  Vendor Unique
  bits 7-0  00h = Read/Write Multiple commands not implemented
     xxh = Maximum number of sectors that can be
     transferred per interrupt on Read and Write
     Multiple commands
 60h WORD 0000h = cannot perform doubleword I/O
  0001h = can perform doubleword I/O
 62h WORD capabilities
  bit 15-9  0=reserved
  bit 8  1=DMA Supported
  bit 7-0  Vendor Unique
 64h WORD reserved
 66h WORD bits 15-8 PIO data transfer cycle timing mode
  bits 7-0  Vendor Unique
 68h WORD bits 15-8 DMA data transfer cycle timing mode
  bits 7-0  Vendor Unique
 6Ah WORD bits 15-1 reserved
  bit 0 1=the fields reported in tranlation mode are valid
   0=the fields reported in translation mode may be valid
 6Ch WORD number of current cylinders
 6Eh WORD number of current heads
 70h WORD number of current sectors per track
 72h DWORD current capacity in sectors
 76h WORD reserved
 78h 136 BYTEs not defined by ATA spec 2.6
100h 64 BYTEs vendor unique
140h 96 BYTEs reserved
Note: the above description is as in the ATA (AT Attachment) Specification.
SeeAlso: #P0516

Bitfields for general drive configuration:
Bit(s) Description (Table 00268)
 15 0   reserved for non-magnetic drives
 14 format speed tolerance gap required
 13 track offset option available
 12 data strobe offset option available
 11 rotational speed tolerance is > 0.5%
 10 disk transfer rate > 10 Mbs
 9 disk transfer rate > 5Mbs but <= 10Mbs
 8 disk transfer rate <= 5Mbs
 7 removable cartridge drive
 6 fixed drive
 5 spindle motor control option implemented
 4 head switch time > 15 usec
 3 not MFM encoded
 2 soft sectored
 1 hard sectored
 0 reserved (0)
--------c-1325-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET FLUSH INTERVAL
 AH = 25h
 BX = interval
Return: AX = status (0000h successful)
Desc: specify how often the cache should write dirty buffers to disk when
   buffered writes are enabled
SeeAlso: AH=21h"QUICKCACHE",AH=2Ch,AH=2Eh
--------c-1326-------------------------------
INT 13 U - QUICKCACHE II v4.20 - UNINSTALL
 AH = 26h
Return: AX = status
     0000h successful
     0001h-00FFh interrupt vector which was hooked by another TSR
SeeAlso: AH=27h
--------c-1327--BX0000-----------------------
INT 13 u - QUICKCACHE II v4.20 - INSTALLATION CHECK
 AH = 27h
 BX = 0000h
Return: AX = 0000h if installed
 BX nonzero if installed
     BH = major version
     BL = binary minor version
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
   Associates, Inc.
SeeAlso: AH=26h,AH=A0h,INT 16/AX=FFA5h/CX=1111h
--------c-1328-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET AUTOMATIC DISMOUNT
 AH = 28h
 AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
SeeAlso: AH=20h"QUICKCACHE"
--------c-1329-------------------------------
INT 13 U - QUICKCACHE II v4.20 - NOP
 AH = 29h
Return: AX = 0000h
--------c-132A-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET BUFFER SIZE
 AH = 2Ah
 AL = buffer size (1-30)
Return: AX = status (0000h successful)
Desc: specify the number of cache sector buffers to dedicate to buffered read
   and write operations
SeeAlso: AH=2Ch,AH=2Dh,AH=39h,AH=3Ah
--------c-132B-------------------------------
INT 13 U - QUICKCACHE II v4.20 - DRIVE ACCESS SOUNDS
 AH = 2Bh
 AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
--------c-132C-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET BUFFERED WRITES
 AH = 2Ch
 AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
Desc: specify whether the cache should delay disk writes
Note: this function enables or disables delayed writes for all drives; use
   AH=38h to change a single drive
SeeAlso: AH=25h"QUICKCACHE",AH=2Dh,AH=2Eh,AH=38h
--------c-132D-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET BUFFERED READ
 AH = 2Dh
 AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
Desc: specify whether the cache should attempt to read ahead of actual
   requests
Note: this function enables or disables read-ahead for all drives; use AH=37h
   to change a single drive
SeeAlso: AH=2Ch,AH=37h
--------c-132E-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET FLUSH COUNT
 AH = 2Eh
 BX = flush count
Return: AX = status (0000h successful)
Desc: specify how many dirty sectors the cache should write after each flush
   interval (see AH=25h"QUICKCACHE") when buffered writes are enabled
SeeAlso: AH=21h"QUICKCACHE",AH=25h"QUICKCACHE",AH=2Ch
--------c-132F-------------------------------
INT 13 - QUICKCACHE II v4.20 - FORCE IMMEDIATE INCREMENTAL FLUSH
 AH = 2Fh
Return: AX = status (0000h successful)
Desc: immediately flush up to "flushcount" dirty sectors to disk as if the
   flush interval had expired
SeeAlso: AH=21h"QUICKCACHE"
--------c-1330-------------------------------
INT 13 u - QUICKCACHE II v4.20 - GET INFO
 AH = 30h
 AL = what to get
     00h system info (see #00269)
     01h drive info (see #00270)
     02h access frequency (array of 30 words)
     03h drive index
  (array of 32 bytes indicating BIOS drive for DOS drive)
 DS:DX -> buffer for info
Return: AX = status (0000h successful, 8000h invalid info specifier)
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
   Associates, Inc.

Format of QUICKCACHE II system info:
Offset Size Description (Table 00269)
 00h BYTE flag: cache enabled
 01h BYTE flag: buffered writes enabled
 02h BYTE flag: buffered reads enabled
 03h BYTE flag: sounds enabled
 04h BYTE flag: autodismount enabled
 05h BYTE ???
 06h BYTE flag: ???
 07h BYTE flag: ???
 08h BYTE flag: "em_assigned"
 09h BYTE flag: emulated EMS
 0Ah BYTE single sector bonus
 0Bh BYTE "sticky_max"
 0Ch BYTE write sector bonus
 0Dh BYTE bonus threshold
 0Eh WORD flush interval
 10h WORD flush count
 12h WORD reserve pool size
 14h WORD remaining space in reserve pool
 16h WORD required free memory
 18h WORD total cache sectors
 1Ah WORD dirty cache sectors
 1Ch BYTE trace buffer size
 1Dh BYTE reserved (padding)
SeeAlso: #00270

Format of QUICKCACHE II drive info [16-element array, one element]:
Offset Size Description (Table 00270)
 00h BYTE DOS drive number
 01h BYTE BIOS drive number
 02h BYTE maximum sector number
 03h BYTE maximum head number
 04h BYTE read buffer size
 05h BYTE write buffer size
 06h BYTE last status
 07h BYTE flag: enabled
 08h BYTE flag: buffered write enabled
 09h BYTE flag: buffered read enabled
 0Ah BYTE flag: in use (drive info is valid)
 0Bh BYTE flag: cylinder flush
 0Ch BYTE reserved (padding)
 0Dh BYTE sectors per track
 0Eh WORD sector size
 10h WORD sectors assigned
 12h WORD dirty sectors
 14h WORD reserved sectors
 16h WORD number of read errors
 18h WORD number of write errors
 1Ah DWORD "rio_count"
 1Eh DWORD number of cache misses
 22h DWORD "wio_count"
 26h DWORD "dio_count"
SeeAlso: #00269
--------c-1331-------------------------------
INT 13 U - QUICKCACHE II v4.20 - RESERVE MEMORY
 AH = 31h
 BX = number of paragraphs of conventional memory to reserve for apps
Return: AX = status (0000h successful)
--------c-1332-------------------------------
INT 13 U - QUICKCACHE II v4.20 - ENABLE CACHING FOR SPECIFIC DRIVE
 AH = 32h
 AL = drive number (00h=A:)
Return: AX = status (0000h successful)
SeeAlso: AH=22h"QUICKCACHE",AH=33h
--------c-1333-------------------------------
INT 13 U - QUICKCACHE II v4.20 - DISABLE CACHING FOR SPECIFIC DRIVE
 AH = 33h
 AL = drive number (00h=A:)
Return: AX = status (0000h successful)
SeeAlso: AH=22h"QUICKCACHE",AH=32h
--------c-1334-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SECTOR LOCKING
 AH = 34h
 AL = function
     00h end sector locking/unlocking
     01h lock all accessed sectors into cache
     02h unlock all accessed sectors and discard from cache
Return: AX = status (0000h successful)
SeeAlso: AH=20h"QUICKCACHE",AH=35h
--------c-1335-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET LOCK POOL SIZE
 AH = 35h
 BX = number of sectors in lock pool
Return: AX = status (0000h successful)
Desc: specify the number of cache sector buffers which may be dedicated to
   data locked into the cache
SeeAlso: AH=34h
--------c-1336-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET TRACE BUFFER SIZE
 AH = 36h
 AL = new size of trace buffer
Return: AX = status (0000h successful)
Note: called with AL=05h during an INT 13/AH=24h"QUICKCACHE" call
SeeAlso: AH=24h"QUICKCACHE"
--------c-1337-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET BUFFERED READS FOR SPECIFIC DRIVE
 AH = 37h
 AL = new state (00h disabled, else enabled)
 DL = drive number (00h = A:)
Return: AX = status (0000h successful)
SeeAlso: AH=2Dh,AH=38h
--------c-1338-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET BUFFERED WRITES FOR SPECIFIC DRIVE
 AH = 38h
 AL = new state (00h disabled, else enabled)
 DL = drive number (00h = A:)
Return: AX = status (0000h successful)
SeeAlso: AH=2Ch,AH=37h
--------c-1339-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET READ BUFFER SIZE FOR SPECIFIC DRIVE
 AH = 39h
 AL = new size of read buffer
 DL = drive number (00h = A:)
Return: AX = status (0000h successful)
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
   Associates, Inc.
SeeAlso: AH=2Ah,AH=3Ah
--------c-133A-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET WRITE BUFFER SIZE FOR SPECIFIC DRIVE
 AH = 3Ah
 AL = new size of write buffer
 DL = drive number (00h = A:)
Return: AX = status (0000h successful)
SeeAlso: AH=2Ah,AH=39h
--------c-133B-------------------------------
INT 13 U - QUICKCACHE II v4.20 - ENABLE/DISABLE ???
 AH = 3Bh
 AL = new state of ??? (01h enabled, else disabled)
Return: AX = status (0000h successful)
Note: is affected by the flag reported at offset 05h of the system info
   returned by AH=30h, and sets the flag at offset 06h
SeeAlso: AH=3Ch
--------c-133C-------------------------------
INT 13 U - QUICKCACHE II v4.20 - ENABLE/DISABLE ???
 AH = 3Ch
 AL = new state of ??? (01h enabled, else disabled)
Return: AX = status (0000h successful)
Note: is affected by the flag reported at offset 05h of the system info
   returned by AH=30h, and sets the flag at offset 07h
SeeAlso: AH=3Bh
--------c-133D-------------------------------
INT 13 U - QUICKCACHE II v4.20 - ENABLE/DISABLE CYLINDER FLUSH FOR DRIVE
 AH = 3Dh
 AL = new state (01h enabled, else disabled)
 DL = drive number (00h = A:)
Return: AX = status (0000h successful)
--------c-133E-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET SINGLE-SECTOR BONUS
 AH = 3Eh
 AL = new value for bonus
Return: AX = status (0000h successful)
Desc: specify the bonus score to give to single-sector transfers in order to
   keep those sectors in the cache longer
--------c-133F-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET BONUS THRESHOLD
 AH = 3Fh
 AL = new value for bonus threshold
Return: AX = status (0000h successful)
--------c-1340-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET "sticky_max"
 AH = 40h
 AL = new value for "sticky_max"
Return: AX = status (0000h successful)
SeeAlso: AH=41h"QUICKCACHE"
--------d-1341--BX55AA-----------------------
INT 13 - IBM/MS INT 13 Extensions - INSTALLATION CHECK
 AH = 41h
 BX = 55AAh
 DL = drive (80h-FFh)
Return: CF set on error (extensions not supported)
     AH = 01h (invalid function)
 CF clear if successful
     BX = AA55h if installed
     AH = major version of extensions
  01h = 1.x
  20h = 2.0 / EDD-1.0
  21h = 2.1 / EDD-1.1
  30h = EDD-3.0
     AL = internal use
     CX = API subset support bitmap (see #00271)
     DH = extension version (v2.0+ ??? -- not present in 1.x)
Note: the Phoenix Enhanced Disk Drive Specification v1.0 uses version 2.0 of
   the INT 13 Extensions API
SeeAlso: AH=42h"INT 13 Ext",AH=48h"INT 13 Ext"

Bitfields for IBM/MS INT 13 Extensions API support bitmap:
Bit(s) Description (Table 00271)
 0 extended disk access functions (AH=42h-44h,47h,48h) supported
 1 removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h)
   supported
 2 enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported
 extended drive parameter table is valid (see #00273,#00278)
 3-15 reserved (0)
--------c-1341-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SAVE/RESTORE ???
 AH = 41h
 AL = direction
     01h save to file
     else restore from file
 ES:DI -> 1024-byte buffer for ???
Return: AX = status (0000h successful, 8000h failed)
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
   Associates, Inc.
SeeAlso: AH=40h"QUICKCACHE"
--------d-1342-------------------------------
INT 13 - IBM/MS INT 13 Extensions - EXTENDED READ
 AH = 42h
 DL = drive number
 DS:SI -> disk address packet (see #00272)
Return: CF clear if successful
     AH = 00h
 CF set on error
     AH = error code (see #00234)
     disk address packet's block count field set to number of blocks
       successfully transferred
SeeAlso: AH=02h,AH=41h"INT 13 Ext",AH=43h"INT 13 Ext"

Format of disk address packet:
Offset Size Description (Table 00272)
 00h BYTE size of packet (10h or 18h)
 01h BYTE reserved (0)
 02h WORD number of blocks to transfer (max 007Fh for Phoenix EDD)
 04h DWORD -> transfer buffer
 08h QWORD starting absolute block number
  (for non-LBA devices, compute as
    (Cylinder*NumHeads + SelectedHead) * SectorPerTrack +
    SelectedSector - 1
 10h QWORD (EDD-3.0, optional) 64-bit flat address of transfer buffer;
    used if DWORD at 04h is FFFFh:FFFFh
--------N-134257DX1234-----------------------
INT 13 U - Beame&Whiteside BWLPD - INSTALLATION CHECK
 AX = 4257h ("BW")
 DX = 1234h
Return: BX = 414Ch if installed
Program: BWLPD is the printer daemon from the BW-NFS package
SeeAlso: INT 62/AH=00h"ETHDEV"
--------d-1343-------------------------------
INT 13 - IBM/MS INT 13 Extensions - EXTENDED WRITE
 AH = 43h
 AL = write flags
    ---v1.0,2.0---
    bit 0: verify write
    bits 7-1 reserved (0)
    ---v2.1+ ---
    00h,01h write without verify
    02h write with verify
 DL = drive number
 DS:SI -> disk address packet (see #00272)
Return: CF clear if successful
     AH = 00h
 CF set on error
     AH = error code (see #00234)
     disk address packet's block count field set to number of blocks
       successfully transferred
Note: the BIOS returns CF set/AH=01h (invalid function) if verify is
   requested but not supported
SeeAlso: AH=03h,AH=41h"INT 13 Ext",AH=42h"INT 13 Ext",AH=44h
--------d-1344-------------------------------
INT 13 - IBM/MS INT 13 Extensions - VERIFY SECTORS
 AH = 44h
 DL = drive number
 DS:SI -> disk address packet (see #00272)
Return: CF clear if successful
     AH = 00h
 CF set on error
     AH = error code (see #00234)
     disk address packet's block count field set to number of blocks
       successfully verified
SeeAlso: AH=04h,AH=41h"INT 13 Ext",AH=42h"INT 13 Ext",AH=47h
--------d-1345-------------------------------
INT 13 - IBM/MS INT 13 Extensions - LOCK/UNLOCK DRIVE
 AH = 45h
 AL = operation
     00h lock media in drive
     01h unlock media
     02h check lock status
 DL = drive number
Return: CF clear if successful
     AH = 00h
     AL = lock state (00h = unlocked)
 CF set on error
     AH = error code (see #00234)
Notes: this function is required to be supported for any removable drives
   numbered 80h or higher
 a device may be locked even if no media is present in the drive
 up to 255 locks may be placed on a drive, and the media will not
   be physically unlocked until all locks have been removed
SeeAlso: AH=41h"INT 13 Ext",AH=46h,AH=49h,INT 15/AH=52h"INT 13 Extensions"
--------d-1346-------------------------------
INT 13 - IBM/MS INT 13 Extensions - EJECT MEDIA
 AH = 46h
 AL = 00h (reserved)
 DL = drive number
Return: CF clear if successful
     AH = 00h
 CF set on error
     AH = error code (see #00234)
SeeAlso: AH=49h,INT 15/AH=52h"INT 13 Extensions"
--------d-1347-------------------------------
INT 13 - IBM/MS INT 13 Extensions - EXTENDED SEEK
 AH = 47h
 DL = drive number
 DS:SI -> disk address packet (see #00272)
Return: CF clear if successful
     AH = 00h
 CF set on error
     AH = error code (see #00234)
Note: this function initiates the seek, and may return before the seek
   actually completes
SeeAlso: AH=0Ch,AH=42h"INT 13 Ext"
--------d-1348-------------------------------
INT 13 - IBM/MS INT 13 Extensions - GET DRIVE PARAMETERS
 AH = 48h
 DL = drive (80h-FFh)
 DS:SI -> buffer for drive parameters (see #00273)
Return: CF clear if successful
     AH = 00h
     DS:SI buffer filled
 CF set on error
     AH = error code (see #00234)
BUGS: several different Compaq BIOSes incorrectly report high-numbered
   drives (such as 90h, B0h, D0h, and F0h) as present, giving them the
   same geometry as drive 80h; as a workaround, scan through disk
   numbers, stopping as soon as the number of valid drives encountered
   equals the value in 0040h:0075h
 Dell machines using PhoenixBIOS 4.0 Release 6.0 fail to correctly
   handle this function if the flag word at DS:[SI+2] is not 0000h
   on entry
SeeAlso: AH=08h,AH=41h,AH=49h,MEM 0040h:0075h

Format of IBM/MS INT 13 Extensions drive parameters:
Offset Size Description (Table 00273)
 00h WORD (call) size of buffer
      (001Ah for v1.x, 001Eh for v2.x, 42h for v3.0)
  (ret) size of returned data
 02h WORD information flags (see #00274)
 04h DWORD number of physical cylinders on drive
 08h DWORD number of physical heads on drive
 0Ch DWORD number of physical sectors per track
 10h QWORD total number of sectors on drive
 18h WORD bytes per sector
---v2.0+ ---
 1Ah DWORD -> EDD configuration parameters (see #00278)
  FFFFh:FFFFh if not available
---v3.0 ---
 1Eh WORD signature BEDDh to indicate presence of Device Path info
 20h BYTE length of Device Path information, including signature and this
    byte (24h for v3.0)
 21h  3 BYTEs reserved (0)
 24h  4 BYTEs ASCIZ name of host bus ("ISA" or "PCI")
 28h  8 BYTEs ASCIZ name of interface type
  "ATA"
  "ATAPI"
  "SCSI"
  "USB"
  "1394" IEEE 1394 (FireWire)
  "FIBRE" Fibre Channel
 30h  8 BYTEs Interface Path (see #00275)
 38h  8 BYTEs Device Path (see #00276)
 40h BYTE reserved (0)
 41h BYTE checksum of bytes 1Eh-40h (two's complement of sum, which makes
    the 8-bit sum of bytes 1Eh-41h equal 00h)
Note: if the size is less than 30 on call, the final DWORD will not be
   returned by a v2.x implementation; similarly for the Device Path info
SeeAlso: #00277,#03196

Bitfields for IBM/MS INT 13 Extensions information flags:
Bit(s) Description (Table 00274)
 0 DMA boundary errors handled transparently
 1 cylinder/head/sectors-per-track information is valid
 2 removable drive
 3 write with verify supported
 4 drive has change-line support (required if drive >= 80h is removable)
 5 drive can be locked (required if drive >= 80h is removable)
 6 CHS information set to maximum supported values, not current media
 15-7 reserved (0)
Note: bits 4-6 are only valid if bit 2 is set
SeeAlso: #00273

Format of EDD v3.0 Interface Path:
Offset Size Description (Table 00275)
---ISA---
 00h WORD 16-bit base address
 02h  6 BYTEs reserved (0)
---PCI---
 00h BYTE PCI bus number
 01h BYTE PCI device number
 02h BYTE PCI function number
 03h  5 BYTEs reserved (0)
SeeAlso: #00273,#00276

Format of EDD v3.0 Device Path:
Offset Size Description (Table 00276)
---ATA---
 00h BYTE flag: 00h = master, 01h = slave
 01h  7 BYTEs reserved (0)
---ATAPI---
 00h BYTE flag: 00h = master, 01h = slave
 01h BYTE logical unit number
 02h  6 BYTEs reserved (0)
---SCSI---
 00h BYTE logical unit number
 01h  7 BYTEs reserved (0)
---USB---
 00h BYTE to be determined
 01h  7 BYTEs reserved (0)
---IEEE1394---
 00h QWORD 64-bit FireWire General Unique Identifier (GUID)
---FibreChannel---
 00h QWORD Word Wide Number (WWN)
SeeAlso: #00273,#00275

Format of Phoenix Enhanced Disk Drive Spec translated drive parameter table:
Offset Size Description (Table 00277)
 00h WORD number of cylinders
 02h BYTE number of heads
 03h BYTE A0h (signature indicating translated table)
 04h BYTE number of physical sectors per track
 05h WORD starting write precompensation cylinder number
 07h BYTE reserved
 08h BYTE control byte (see #03198 at INT 41"DISK 0")
 09h WORD number of physical cylinders
 0Bh BYTE number of physical heads
 0Ch WORD cylinder number of landing zone
 0Eh BYTE number of logical sectors per track
 0Fh BYTE checksum
Program: the Phoenix Enhanced Disk Drive Specification is an addition to the
   IBM/MS INT 13 extensions
SeeAlso: #00278,#03196

Format of Phoenix Enhanced Disk Drive Spec Fixed Disk Parameter Table:
Offset Size Description (Table 00278)
 00h WORD physical I/O port base address
 02h WORD disk-drive control port address
 04h BYTE drive flags (see #00279)
 05h BYTE proprietary information
  bits 7-4 reserved (0)
  bits 3-0: Phoenix proprietary (used by BIOS)
 06h BYTE IRQ for drive (bits 3-0; bits 7-4 reserved and must be 0)
 07h BYTE sector count for multi-sector transfers
 08h BYTE DMA control
  bits 7-4: DMA type (0-2) as per ATA-2 specification
  bits 3-0: DMA channel
 09h BYTE programmed I/O control
  bits 7-4: reserved (0)
  bits 3-0: PIO type (1-4) as per ATA-2 specification
 0Ah WORD drive options (see #00280)
 0Ch  2 BYTEs reserved (0)
 0Eh BYTE extension revision level (high nybble=major, low nybble=minor)
  (currently 10h for v1.0 and 11h for v1.1-3.0)
 0Fh BYTE 2's complement checksum of bytes 00h-0Eh
  8-bit sum of all bytes 00h-0Fh should equal 00h
Note: this structure is also called the Device Paramter Table Extension
   (DPTE)
SeeAlso: #00277

Bitfields for Phoenix Enhanced Disk Drive Spec drive flags:
Bit(s) Description (Table 00279)
 7 reserved (1)
 6 LBA enabled
 5 reserved (1)
 4 drive is slave
 3-0 reserved (0)
SeeAlso: #00278,#00280

Bitfields for Phoenix Enhanced Disk Drive Spec drive options:
Bit(s) Description (Table 00280)
 0 fast PIO enabled
 1 fast DMA access enabled
 2 block PIO (multi-sector transfers) enabled
 3 CHS translation enabled
 4 LBA translation enabled
 5 removable media
 6 ATAPI device (CD-ROM)
 7 32-bit transfer mode
---v1.1+ ---
 8 ATAPI device uses DRQ to signal readiness for packet command
 (must be 0 if bit 6 is 0)
 10-9 translation type (must be 00 if bit 3 is 0)
 00 Phoenix bit-shifting translation
 01 LBA-assisted translation
 10 reserved
 11 proprietary translation
---v3.0---
 11 Ultra DMA access enabled
 15-12 reserved (0)
SeeAlso: #00278,#00279
--------d-1349-------------------------------
INT 13 - IBM/MS INT 13 Extensions - EXTENDED MEDIA CHANGE
 AH = 49h
 DL = drive number
Return: CF clear if media has not changed
     AH = 00h
 CF set if media may have changed
     AH = 06h (see #00234)
Note: unlike AH=16h, any drive number may be specified
SeeAlso: AH=16h,AH=41h"INT 13 Ext",AH=46h
--------d-134A-------------------------------
INT 13 - Bootable CD-ROM - INITIATE DISK EMULATION
 AH = 4Ah
 AL = 00h
 DS:SI -> specification packet (see #00281)
Return: CF clear if successful
 CF set on error (drive will not be in emulation mode)
 AX = return codes
SeeAlso: AH=48h,AX=4B00h,AH=4Ch,AH=4Dh

Format of Bootable CD-ROM Specification Packet:
Offset Size Description (Table 00281)
 00h BYTE size of packet in bytes (13h)
 01h BYTE boot media type (see #00282)
 02h BYTE drive number
  00h floppy image
  80h bootable hard disk
  81h-FFh nonbootable or no emulation
 03h BYTE CD-ROM controller number
 04h DWORD Logical Block Address of disk image to emulate
 08h WORD device specification (see also #00282)
  (IDE) bit 0: drive is slave instead of master
  (SCSI) bits 7-0: LUN and PUN
   bits 15-8: bus number
 0Ah WORD segment of 3K buffer for caching CD-ROM reads
 0Ch WORD load segment for initial boot image
  if 0000h, load at segment 07C0h
 0Eh WORD number of 512-byte virtual sectors to load
  (only valid for AH=4Ch)
 10h BYTE low byte of cylinder count (for INT 13/AH=08h)
 11h BYTE sector count, high bits of cylinder count (for INT 13/AH=08h)
 12h BYTE head count (for INT 13/AH=08h)
SeeAlso: #00283,AH=08h

Bitfields for Bootable CD-ROM boot media type:
Bit(s) Description (Table 00282)
 3-0 media type
 0000 no emulation
 0001 1.2M diskette
 0010 1.44M diskette
 0011 2.88M diskette
 0100 hard disk (drive C:)
 other reserved
 5-4 reserved (0)
 6 image contains ATAPI driver
 7 image contains SCSI driver(s)
SeeAlso: #00281
--------d-134B00-----------------------------
INT 13 - Bootable CD-ROM - TERMINATE DISK EMULATION
 AX = 4B00h
 DL = drive number or 7Fh to terminate all emulations
 DS:SI -> empty specification packet (see #00281)
Return: CF clear if successful
 CF set on error (drive will still be in emulation mode)
 AX = return codes
 DS:SI specification packet filled
SeeAlso: AH=48h,AH=4Ah,AX=4B00h,AH=4Ch,AH=4Dh
--------d-134B01-----------------------------
INT 13 - Bootable CD-ROM - GET STATUS
 AX = 4B01h
 DL = drive number
 DS:SI -> empty specification packet (see #00281)
Return: CF clear if successful
 CF set on error
 AX = return codes
 DS:SI specification packet filled
Note: same as AX=4B00h, but does not terminate emulation
SeeAlso: AH=48h,AH=4Ah,AX=4B00h,AH=4Ch,AH=4Dh
--------d-134C-------------------------------
INT 13 - Bootable CD-ROM - INITIATE DISK EMULATION AND BOOT
 AH = 4Ch
 AL = 00h
 DS:SI -> specification packet (see #00281)
Return: never, if successful
 CF set (error while attempting to boot)
 AX = error codes
SeeAlso: AH=48h,AH=4Ah,AX=4B00h,AH=4Dh
--------d-134D00-----------------------------
INT 13 - Bootable CD-ROM - RETURN BOOT CATALOG
 AX = 4D00h
 DS:SI -> command packet (see #00283)
Return: CF clear if successful
 CF set on error
 AX = return codes
SeeAlso: AH=48h,AH=4Ah,AX=4B00h,AH=4Ch

Format of Bootable CD-ROM "get boot catalog" command packet:
Offset Size Description (Table 00283)
 00h BYTE size of packet in bytes (08h)
 01h BYTE number of sectors of boot catalog to read
 02h DWORD -> buffer for boot catalog
 06h WORD first sector in boot catalog to transfer
SeeAlso: #00281
--------d-134E-------------------------------
INT 13 - IBM/MS INT 13 Extensions v2.1+ - SET HARDWARE CONFIGURATION
 AH = 4Eh
 AL = function
     00h enable prefetch
     01h disable prefetch
     02h set maximum PIO transfer mode
     03h set PIO mode 0
     04h set default PIO transfer mode
     05h enable INT 13h DMA maximum mode
     06h disable INT 13h DMA
 DL = drive number
Return: CF clear if successful
     AH = 00h
     AL = status
  00h command was safe (only affected specified drive)
  01h other devices are affected
 CF set on error
     AH = error code (see #00234)
Note: DMA and PIO modes are mutually exclusive, so selecting DMA disables
   PIO (for either the specified device or all devices on that
   controller), and selecting PIO disables DMA
SeeAlso: AH=41h"INT 13 Extensions",AX=5001h"Enhanced Disk Drive"
--------d-135001-----------------------------
INT 13 - Enhanced Disk Drive Spec v3.0 - SEND PACKET COMMAND
 AX = 5001h
 DL = drive number
 ES:BX -> command packet (see #00284)
Return: CF clear if successful
     AH = 00h
 CF set on error
     AH = error code
Desc: send data to and from a serial packet-oriented device, such as IEEE1394
   and USB
SeeAlso: AH=41h"INT 13 Extensions",AH=4Eh

Format of Enhanced Disk Drive Spec v3.0 command packet:
Offset Size Description (Table 00284)
 00h WORD signature B055h
 02h BYTE length of packet in bytes
 03h BYTE reserved (0)
 04h  N BYTEs formatted packet data
--------v-135001------------------------
INT 13 - VIRUS - "Andropinis" - INSTALLATION CHECK
 AX = 5001h
Return: AX = 0150h if resident
SeeAlso: AX=FD50h"VIRUS",INT 21/AX=0B56h
--------v-135342CX0001-----------------------
INT 13 - ScanBoot - INSTALLATION CHECK
 AX = 5342h ("SB")
 CX = 0001h
 DX = 0000h
Return: CF clear if ScanBoot installed
    AX = 0000h
    CX = serial number ("SW" if shareware release)
    DX = version
    BX,SI,ES destroyed
Program: ScanBoot is a virus-detection TSR by PanSoft
--------d-135501-----------------------------
INT 13 - Seagate ST01/ST02 - Inquiry
 AX = 5501h
 DH = number of bytes to transfer
 DL = drive ID (80h, 81h, ...)
 ES:BX -> buffer for results
Return: ES:BX buffer filled with the Inquiry results
Notes: the ST01/ST02 BIOS does not return any success/failure indication,
   so all commands must be assumed to have been successful
 the ST01/ST02 BIOS always maps its drives after the previous BIOS
   drives without changing the BIOS drive count at 0040h:0075h
 this command is identical to the SCSI Inquiry command
--------d-135502-----------------------------
INT 13 - Seagate ST01/ST02 - RESERVED
 AX = 5502h
--------d-135503-----------------------------
INT 13 - Seagate ST01/ST01 - Set Device Type Qualifier (DTQ)
 AX = 5503h
 DH = DTQ byte (see #00285)
 DL = drive ID (80h, 81h, ...)
Return: nothing

Bitfields for DTQ byte:
Bit(s) Description (Table 00285)
 7 reserved
 6 SCSI drive attached
 5 reserved
 4 selected drive is ST225N/NP (Paired)
 3 selected drive is ST225N
 2 Host Adapter checks parity on the selected drive
 1 selected drive has been installed
 0 Seagate installation software present
--------d-135504-----------------------------
INT 13 U - Seagate - ??? - RETURN IDENTIFICATION
 AX = 5504h
 DX = drive (bit 7 set for hard disk)
Return: CF clear if successful
     AX = 4321h if ST01/ST02h
     AX = 4322h if ??? Seagate controller
 CF set on error
SeeAlso: AX=5505h,AX=5514h
--------d-135504-----------------------------
INT 13 - Seagate ST01/ST02 - RETURN IDENTIFICATION
 AX = 5504h
 DL = drive ID (80h, 81h, ...)
Return: AX = 4321h
 BL = selected drive number (00h, 01h)
 BH = number of drives attached to Host Adapter (max. 2)
--------d-135505-----------------------------
INT 13 - Seagate - ??? - PARK HEADS
 AX = 5505h
 DX = drive (bit 7 set for hard disk)
Return: CF clear if successful
 CF set on error
SeeAlso: AX=5504h,AX=5515h
--------d-135505-----------------------------
INT 13 - Seagate ST01/ST02 - PARK HEADS
 AX = 5505h
 DL = drive ID (80h, 81h, ...)
 DH = subfunction
     00h park heads (SCSI Stop command)
     01h un-park heads (SCSI Start command)
Return: nothing
--------d-135506-----------------------------
INT 13 - Seagate ST01/ST02 - SCSI Bus Parity
 AX = 5506h
 DL = drive ID (80h, 81h, ...)
 DH = subfunction
     00h disable parity check
     01h enable parity check
     02h return current parity setting
Return: AL = status
     00h parity checking disabled
     01h parity checking enabled
--------d-135507-----------------------------
INT 13 - Seagate ST01/ST02 - RESERVED FUNCTIONS
 AX = 5507h to 550Dh
Note: officially listed as "reserved"
--------d-135514-----------------------------
INT 13 U - Seagate - ???
 AX = 5514h
 DX = drive (bit 7 set for hard disk)
Return: CF clear if successful
 CF set on error
 AX = return value (FEBEh,FEBFh,FEDAh,FEDBh)
SeeAlso: AX=5504h,AX=5515h
--------d-135515-----------------------------
INT 13 U - Seagate - PARK HEADS???
 AX = 5515h
 DX = drive (bit 7 set for hard disk)
Return: CF clear if successful
 CF set on error
Note: appears to be identical to AX=5505h
SeeAlso: AX=5504h,AX=5505h
--------d-1359-------------------------------
INT 13 - SyQuest - Generic SCSI pass through
 AH = 59h
 CX = HOST_ID, 0-based
 DX = 80h
 ES:BX pointer to SCSI structure (see #00286)
Return: CF clear
 AH = 95h
SeeAlso: AH=12h"SyQuest",AH=13h"SyQuest",AH=1Fh"SyQuest"

Format of SyQuest SCSI structure:
Offset Size Description (Table 00286)
 00h WORD opcode (see #00287)
 02h BYTE target's SCSI ID
 03h BYTE target's logical unit number
 04h BYTE data direction (00h no data xfer, 01h data in, FFh data out)
 05h BYTE host status
  00h successful
  01h selection time out
  02h data over-run or under-run
 06h BYTE target status at command completion
  00h successful
  02h check status
  08h busy
 07h BYTE command data block length
 08h DWORD request data length
 0Ch DWORD result data length (actual length of data transferred)
 10h DWORD -> CDB (see #03236,#03237,#03238)
 14h DWORD -> data buffer
Note: The handler does not perform a 'Request Sense' command if there was an
   error

(Table 00287)
Values for SCSI opcode:
 00h verify interface
 clears carry flag and returns if function is available
 01h returns the ID of the INT 13h Handler in a NULL terminated string of
 length less than 40 byte including the terminator.
 The string is stored in the buffer pointed by p_buf.
 02h device mapping info. The caller provides a one byte buffer.
 The handler stores the Int 13h Device ID (80h or above) in the buffer.
 It stores 0 if that target does not exists.
 03h execute SCSI command
 04h device reset
 05h SCSI bus reset
SeeAlso: #00286
--------d-1370-------------------------------
INT 13 - Priam EDVR.SYS DISK PARTITIONING SOFTWARE???
 AH = 70h
 ???
Return: ???
Note: Priam's EDISK.EXE (FDISK replacement) and EFMT.EXE (low-level
   formatting program) make this call, presumably to EDVR.SYS (the
   partitioning driver)
SeeAlso: AH=ADh
----------1375-------------------------------
INT 13 - ???
 AH = 75h
 ???
Return: AH = ???
 ???
Note: intercepted by PC-Cache (v5.1 only)
----------1376-------------------------------
INT 13 - ???
 AH = 76h
 ???
Return: AH = ???
 ???
Note: intercepted by PC-Cache (v5.1 only)
--------c-137B00-----------------------------
INT 13 - NOW! v3.05 - GET INFORMATION
 AX = 7B00h
 CX:DX -> 1F8h-byte buffer for information record (see #00288)
Return: AX = 0000h
 BX = segment of main resident code
 ES = ???
Program: NOW! is a disk cache by Vertisoft Systems, Inc.
SeeAlso: AX=7B02h,AH=EFh

Format of NOW! information record:
Offset Size Description (Table 00288)
 00h 80 BYTEs name of directory from which NOW! was started
 50h 424 BYTEs ???
 81h  ? BYTEs array of bytes for ???
 F7h 250 BYTEs array of 25 entries, one per drive???
 Offset Size Description
  00h  2 BYTEs ???
  02h WORD ???
  04h WORD ???
  06h  4 BYTEs ???
1F1h  7 BYTEs ???
--------c-137B01-----------------------------
INT 13 - NOW! v3.05 - ???
 AX = 7B01h
Return: DX = segment of ???
SeeAlso: AX=7B00h
--------c-137B02-----------------------------
INT 13 - NOW! v3.05 - SET INFORMATION
 AX = 7B02h
 BX = segment of ??? (10h above a PSP)
 CX:DX -> 1F8h-byte information record (see #00288)
Return: ???
Program: NOW! is a disk cache by Vertisoft Systems, Inc.
Note: NOW! grabs the INT 24h value from the PSP reached via the segment in
   BX
SeeAlso: AX=7B00h
--------c-137B03-----------------------------
INT 13 - NOW! v3.05 - ???
 AX = 7B03h
 ???
Return: ???
SeeAlso: AX=7B00h,AX=7B04h
--------c-137B04-----------------------------
INT 13 - NOW! v3.05 - ???
 AX = 7B04h
 ???
Return: ???
SeeAlso: AX=7B03h
--------c-137B05-----------------------------
INT 13 - NOW! v3.05 - GET DISK ACCESSES???
 AX = 7B05h
Return: BX:AX = number of physical accesses???
 DX:CX = total disk accesses???
SeeAlso: AX=7B00h,AX=7B06h
--------c-137B06-----------------------------
INT 13 - NOW! v3.05 - GET ???
 AX = 7B06h
 BX = ???
Return: AX = 0000h
 BX = ???
SeeAlso: AX=7B05h,AX=7B07h
--------c-137B07-----------------------------
INT 13 - NOW! v3.05 - GET ???
 AX = 7B07h
Return: AX = ???
 BX = ???
 CX = ???
 DX = ???
SeeAlso: AX=7B06h
--------c-137B08-----------------------------
INT 13 - NOW! v3.05 - ???
 AX = 7B08h
 CX = ??? (default 00h)
Return: ???
SeeAlso: AX=7B00h
--------c-1380--CX6572-----------------------
INT 13 - FAST! v4.02+ - API
 AH = 80h
 CX = 6572h
 DX = 1970h
 ES:BX -> request packet (see #00290)
 AL = function number (see #00289)
Return: AH = status (except function 06h)
     00h if successful
     01h invalid function
     05h not supported by the installed variant
 CF clear if successful
 CF set on error
 AL may be destroyed
Program: FAST! is a disk cache by Future Computing Systems and marketed by
   BLOC Publishing Corp.
SeeAlso: AX=8001h,AX=8006h,AX=8007h
Index: hotkeys;FAST!

(Table 00289)
Values for FAST! function:
 01h get cache information (see AX=8001h)
 04h disable cache
 05h enable cache and reset statistics
 06h installation check (see AX=8006h)
 07h unhook interrupts (see AX=8007h)
 09h flush cache
 0Ah (v4.02+) enable staged writes
 0Bh (v4.02+) disable staged writes
 0Ch (v4.02+) enable beep on flush
 0Dh (v4.02+) disable beep on flush
 0Eh ???
 0Fh ???
 10h (v4.12+) enable hotkeys
 11h (v4.12+) disable hotkeys
 12h (v4.13+) set idle delay
 13h (v4.13+) set flush dirty percentage
 14h (v5.00+) enable mouse checks
 15h (v5.00+) disable mouse checks
 16h (v5.00d+) reduce cache size to minimum
 17h (v5.00d+) increase cache size to maximum

Format of FAST! request packet:
Offset Size Description (Table 00290)
 00h DWORD pointer to 19-byte signature string (see #00291)
 04h DWORD pointer to buffer for data (if needed by function)

(Table 00291)
Values for FAST! v4.04-v5.03 signature string:
 13h 07h 06h 08h 11h 18h 0Fh 0Eh 02h 18h 13h 08h 0Bh 08h 01h 00h 04h 08h 15h
--------c-138001CX6572-----------------------
INT 13 - FAST! v4.02+ - GET CACHE INFORMATION
 AX = 8001h
 CX = 6572h
 DX = 1970h
 ES:BX -> request packet (see #00292)
Return: AH = 00h if successful
SeeAlso: AH=80h,AX=8006h

Format of FAST! request packet:
Offset Size Description (Table 00292)
 00h DWORD -> 19-byte signature string (see #00291)
 04h DWORD -> buffer for cache information (see #00293)

Format of FAST! cache information (v5.00-5.03):
Offset Size Description (Table 00293)
 00h WORD binary version number of FAST! (v5.00 = 01F4h)
 02h BYTE revision letter (61h = X.XXa, 62h = X.XXb, etc.)
 03h BYTE FAST! variant
  (01h = FASTE, 02h = FASTX BIOS, 04h = FASTC, 20h = FASTX XMS)
 04h DWORD total number of read requests
 08h DWORD number of physical disk reads
 0Ch DWORD grabbed hash buckets
 10h DWORD "st_386mem"
 14h DWORD total number of writes (only counted when staging enabled)
 18h DWORD number of physical disk writes (only when staging enabled)
 1Ch DWORD number of write errors while flushing cache
 20h WORD flags1 (see #00294)
 22h WORD flags
  bit 0: ???
  bit 1: staged writes enabled
 24h WORD ???
 26h WORD maximum cache size in KB
 28h WORD minimum cache size in KB
 2Ah WORD segment of first cache buffer (FASTC)
  segment of EMS page frame (FASTE)
  XMS handle (FASTX XMS)
 2Ch WORD number of hash buckets containing no entries
 2Eh WORD number of hash buckets containing one entry
 30h WORD number of hash buckets containing two entries
 32h WORD number of hash buckets containing three entries
 34h WORD number of hash buckets containing four entries
 36h WORD number of hash buckets containing five entries
 38h WORD maximum contiguous sectors
 3Ah WORD hash factor
 3Ch WORD number of paragraphs of memory used below 1M
 3Eh WORD entries per hash bucket
 40h WORD idle delay in seconds
 42h  2 BYTEs ???
 44h WORD staged write threshold percentage
 46h  2 BYTEs ???
 48h WORD number of dirty sectors
 4Ah WORD number of staged write buffers
 4Ch WORD current cache size in KB
 4Eh WORD beep frequency in Hz
 50h WORD ???
 52h WORD ???

Bitfields for FAST! flags1:
Bit(s) Description (Table 00294)
 0 beep on flush
 3 hotkeys enabled
 4 mouse idle check enabled
 8 caching enabled
 13 ???
--------c-138006CX6572-----------------------
INT 13 - FAST! v4.02+ - INSTALLATION CHECK
 AX = 8006h
 CX = 6572h
 DX = 1970h
 ES:BX -> request packet (see #00295)
Return: AX = 1965h if installed
SeeAlso: AH=80h,AX=8001h,AX=8007h

Format of FAST! request packet:
Offset Size Description (Table 00295)
 00h DWORD -> 19-byte signature string (see #00291)
--------c-138007CX6572-----------------------
INT 13 - FAST! v4.02+ - UNHOOK INTERRUPTS
 AX = 8007h
 CX = 6572h
 DX = 1970h
 ES:BX -> request packet (see #00296)
Return: AX = 1965h if installed
SeeAlso: AH=80h,AX=8006h
Index: uninstall;FAST!

Format of FAST! request packet:
Offset Size Description (Table 00296)
 00h DWORD -> 19-byte signature string (see #00291)
--------c-1381--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - ???
 AH = 81h
 SI = 4358h
 ???
Return: ???
Note: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call (PC-Cache v5.1 corresponds
   to PC-Kwik v3.20 and PC-Cache v5.5 to PC-Kwik v3.27)
 returns immediately in PC-Cache v5.x
Index: PC-Cache|Qualitas Qcache
--------c-1382--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - ???
 AH = 82h
 SI = 4358h
 ???
Return: AL = ???
Note: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call
SeeAlso: AH=84h
Index: PC-Cache|Qualitas Qcache
--------c-1383--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - ???
 AH = 83h
 SI = 4358h
 AL = ???
 ES:BX -> ???
 ???
Return: ???
Note: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call
SeeAlso: AH=85h
Index: PC-Cache|Qualitas Qcache
--------c-1384--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - ???
 AH = 84h
 SI = 4358h
 AL = ???
 ???
Return: AL = ???
Note: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call
SeeAlso: AH=82h
Index: PC-Cache|Qualitas Qcache
--------c-1385--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - ???
 AH = 85h
 SI = 4358h
 AL = ???
 DL = ???
 ???
Return: ???
Note: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call (PC-Cache v5.1 corresponds
   to PC-Kwik v3.20)
SeeAlso: AH=83h
Index: PC-Cache|Qualitas Qcache
--------c-1386--SI4358-----------------------
INT 13 - Super PC-Kwik v4.00+ - ???
 AH = 86h
 SI = 4358h
 ???
Return: ???
Note: Qualitas Qcache v4.00 is an OEM version of Super PC-Kwik v4.00, and
   thus supports this call
Index: Qualitas Qcache
--------c-1387--SI4358-----------------------
INT 13 - Super PC-Kwik v4.00+ - ???
 AH = 87h
 SI = 4358h
 ???
Return: AH = status??? (00h)
 CX = ???
 DX = ??? (0000h)
Note: Qualitas Qcache v4.00 is an OEM version of Super PC-Kwik v4.00, and
   thus supports this call
Index: Qualitas Qcache
--------c-1388--SI4358-----------------------
INT 13 - Super PC-Kwik v4.00+ - ???
 AH = 88h
 SI = 4358h
 ???
Return: AH = status??? (00h)
 CX = ???
 DX = ??? (0000h)
Note: Qualitas Qcache v4.00 is an OEM version of Super PC-Kwik v4.00, and
   thus supports this call
Index: Qualitas Qcache
--------c-1389--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 89h
 SI = 4358h
 ???
Return: ???
--------c-138A--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 8Ah
 SI = 4358h
 ???
Return: ???
--------c-138EED-----------------------------
INT 13 - HyperDisk v4.01+ - ???
 AX = 8EEDh
 ???
Return: ???
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
SeeAlso: AX=8EEEh,AX=8EEFh,AH=EEh,INT 2F/AX=DF00h
--------c-138EEE-----------------------------
INT 13 - HyperDisk v4.01+ - ???
 AX = 8EEEh
Return: CF set
 AX = CS of HyperDisk resident code
 ???
Note: identical to AX=8EEFh in HYPERDKX v4.21-4.30
SeeAlso: AX=8EEDh,AX=8EEFh,AH=EEh
--------c-138EEF-----------------------------
INT 13 - HyperDisk v4.01+ - ???
 AX = 8EEFh
Return: CF set
 AX = CS of HyperDisk resident code
 ???
Note: identical to AX=8EEEh in HYPERDKX v4.21-4.30
SeeAlso: AX=8EEDh,AX=8EEEh,AH=EEh
--------c-1392--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 92h
 SI = 4358h
 ???
Return: AH = status??? (00h)
 DL = ???
SeeAlso: AH=93h
--------c-1393--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 93h
 SI = 4358h
 ???
Return: AH = status??? (00h)
 AL = ???
SeeAlso: AH=92h
--------c-1394--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 94h
 SI = 4358h
 ???
Return: ???
--------c-1395--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 95h
 SI = 4358h
 ???
Return: AH = status??? (00h)
 DX = ???
--------c-1396--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 96h
 SI = 4358h
 AL = ??? (01h)
 BX = ??? (0790h)
 DL = ???
Return: AH = status??? (00h)
 DX = ???
--------c-1397--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 97h
 SI = 4358h
 ???
Return: ???
--------c-1398--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 98h
 SI = 4358h
 ???
Return: ???
--------c-1399--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 99h
 SI = 4358h
 ???
Return: ???
--------c-139A--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 9Ah
 SI = 4358h
 ???
Return: ???
--------c-139B--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 9Bh
 SI = 4358h
 ???
Return: ???
--------c-139C--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 9Ch
 SI = 4358h
 ???
Return: ???
Note: functions 9Ch and 9Dh are the only ones which are fully reentrant; all
   other PC-Kwik API calls (INT 13/81h-B0h) return AX=0200h and CF clear
   if a previous call is still in progress
--------c-139D--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = 9Dh
 SI = 4358h
 ???
Return: ???
--------c-13A0--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - GET RESIDENT CODE SEGMENT
 AH = A0h
 SI = 4358h
Return: AX = segment of resident code
Note: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call (note that PC-Cache v5.5
   corresponds to PC-Kwik v3.27)
SeeAlso: INT 16/AX=FFA5h/CX=1111h
Index: PC-Cache|Qualitas Qcache
--------c-13A1--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - FLUSH CACHE
 AH = A1h
 SI = 4358h
Return: CF clear
 AH = 00h (v5.10)
Notes: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call (note that PC-Cache v5.1
   corresponds to PC-Kwik v3.20)
 this function is one out of several cache flush calls issued by the
   PTS-DOS 6.51 and S/DOS 1.0 kernel before rebooting.
SeeAlso: INT 16/AX=FFA5h/CX=FFFFh
Index: PC-Cache|Qualitas Qcache
--------c-13A2--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - ???
 AH = A2h
 SI = 4358h
 ???
Return: ???
Note: PC Tools PC-Cache 5.x and Qualitas Qcache 4.00 are OEM versions of
   Super PC-Kwik, and thus support this call (note that PC-Cache v5.1
   corresponds to PC-Kwik v3.20)
Index: PC-Cache|Qualitas Qcache
--------c-13A3--SI4358-----------------------
INT 13 U - Super PC-Kwik v5.10+ - DISABLE CACHE
 AH = A3h
 SI = 4358h
Return: CF clear
SeeAlso: AH=A4h
--------c-13A4--SI4358-----------------------
INT 13 U - Super PC-Kwik v5.10+ - ENABLE CACHE
 AH = A4h
 SI = 4358h
Return: CF clear
SeeAlso: AH=A3h
--------c-13A5--SI4358-----------------------
INT 13 CU - Super PC-Kwik v5.10+ - PROGRAM TERMINATION NOTIFICATION
 AH = A5h
 SI = 4358h
Return: AX = ???
 SI = ???
Notes: called and used internally by Super PC-Kwik when a program terminates
   via INT 21/AH=00h, INT 21/AH=31h, or INT 21/AH=4Ch
 this call is not supported by Qualitas Qcache 4.00
Index: PC-Cache
SeeAlso: AH=A6h,AH=A9h,INT 21/AH=00h,INT 21/AH=31h,INT 21/AH=4Ch
--------c-13A6--SI4358-----------------------
INT 13 CU - Super PC-Kwik v5.10+ - PROGRAM LOAD NOTIFICATION
 AH = A6h
 SI = 4358h
 DS:DX -> ASCIZ program name
 ES:BX -> EXEC data block (see #01590 at INT 21/AH=4Bh)
Return: ???
Note: called and used internally by Super PC-Kwik when a program is loaded
   with INT 21/AX=4B00h
SeeAlso: AH=A5h,AH=A9h,INT 21/AH=4Bh
--------c-13A7--SI4358-----------------------
INT 13 CU - Super PC-Kwik 5.1 - ???
 AH = A7h
 SI = 4358h
Return: ???
Note: called and used internally by Super PC-Kwik on some INT 21 calls
SeeAlso: AH=A5h,AH=A6h,AH=A8h
--------v-13A759-----------------------------
INT 13 U - Novell DOS 7 - SDRes v27.03 - ???
 AX = A759h
Return: AX = 59A7h if installed
     DX:BX -> ??? data
Program: SDRes is the resident portion of the Search&Destroy antiviral by
   Fifth Generation Systems, as bundled with Novell DOS 7
SeeAlso: INT 21/AH=0Eh/DL=ADh
--------c-13A8--SI4358-----------------------
INT 13 CU - Super PC-Kwik 5.1 - ???
 AH = A8h
 SI = 4358h
Return: ???
Note: called and used internally by Super PC-Kwik on some INT 21 calls
SeeAlso: AH=A5h,AH=A6h,AH=A7h
--------c-13A9--SI4358-----------------------
INT 13 CU - Super PC-Kwik 5.1 - EXITCODE RETRIEVAL NOTIFICATION
 AH = A9h
 SI = 4358h
Return: ???
Note: called and used internally by Super PC-Kwik when an application issues
   INT 21/AH=4Dh
SeeAlso: AH=A5h,AH=A6h,INT 21/AH=4Dh
--------c-13AA--SI4358-----------------------
INT 13 - Super PC-Kwik v4+ - ???
 AH = AAh
 SI = 4358h
 ???
Return: ???
Note: Qualitas Qcache is an OEM version of Super PC-Kwik, and thus supports
   this call
--------c-13AB--SI4358-----------------------
INT 13 - Super PC-Kwik v4+ - ???
 AH = ABh
 SI = 4358h
 ???
Return: ???
Note: Qualitas Qcache is an OEM version of Super PC-Kwik, and thus supports
   this call
--------c-13AC--SI4358-----------------------
INT 13 - Super PC-Kwik v4+ - ???
 AH = ACh
 SI = 4358h
 ???
Return: ???
Note: Qualitas Qcache is an OEM version of Super PC-Kwik, and thus supports
   this call
--------d-13AD-------------------------------
INT 13 - Priam HARD DISK CONTROLLER???
 AH = ADh
 ???
Return: ???
Note: this call is made from Priam's EFMT.EXE (low-level formatter), probably
   to check the ROM type on the controller for their hard disk kits
SeeAlso: AH=70h
--------c-13AD--SI4358-----------------------
INT 13 - Super PC-Kwik v4+ - ???
 AH = ADh
 SI = 4358h
 ???
Return: ???
Note: Qualitas Qcache is an OEM version of Super PC-Kwik, and thus supports
   this call
--------c-13AE--SI4358-----------------------
INT 13 - Super PC-Kwik v5.10+ - ???
 AH = AEh
 SI = 4358h
 ???
Return: ???
--------c-13B0--SI4358-----------------------
INT 13 - Super PC-Kwik v3.20+ - ???
 AH = B0h
 SI = 4358h
 ???
Return: ???
Note: PC Tools PC-Cache 5.x is an OEM version of Super PC-Kwik, and thus
   supports this call; Qualitas Qcache does not support it
Index: PC-Cache
----------13BF00-----------------------------
INT 13 - Mylex/Adaptec??? - ???
 AX = BF00h
 BX = PCI address???
 DI = 0000h ???
 DL = drive number (80h = C:)
Return: ???
Note: some poorly-commented code using this function notes that there had
   been a workaround for some Mylex BIOS bug by setting DL to 8Fh
--------d-13E000-----------------------------
INT 13 - XBIOS - COMMAND
 AX = E000h
 CX = 0
 DL = drive number (80h,81h,82h,83h)
 ES:BX = pointer to XBIOS Command Block (see #00297)
Return: CF clear if successful
     CX = 1234h XBIOS Signature
 CF set on error
Program: XBIOS is a driver in some versions of Disk Manager that is
   loaded from the disk MBR, replacing the ROM BIOS disk support
   e.g. adding LBA mode support, and read/write multiple.
SeeAlso: AH=F9h"SWBIOS"

Format of XBIOS Command Block:
Offset Size Description (Table 00297)
 00h BYTE function
  0Eh Get XBIOS Configuration Information
      Return: buffer points to Ontrackr_Ref_Data structure
   (see #00298)
 01h BYTE reserved (must be zero before function call)
 02h DWORD buffer pointer - Input or output depending on opcode
SeeAlso: #00298,#00299

Format of Ontrackr_Ref_Data structure:
Offset Size Description (Table 00298)
 00h WORD Size of structure (33h)
 02h BYTE VxD Chain mode
 03h 12 BYTEs Drive 1: Ontrackr_VxD_Data structure (see #00299)
 0Fh 12 BYTEs Drive 2: Ontrackr_VxD_Data structure
 1Bh 12 BYTEs Drive 3: Ontrackr_VxD_Data structure
 27h 12 BYTEs Drive 4: Ontrackr_VxD_Data structure (see #00299)
SeeAlso: #00297,#00299

Format of Ontrackr_VxD_Data structure:
Offset Size Description (Table 00299)
 00h BYTE INT 13h drive number
 01h DWORD Delta skew value
 05h BYTE Physical  heads (Word 3 of Identify Data)
 06h BYTE Physical sectors per track (Word 6 of Identify Data)
 07h BYTE Multiple Block Size (Blocking factor)
 08h BYTE Read/Write Multiple disable flags
  00001000b drive supports r/w multiple
  00000100b do not use read multiple
  00000010b do not use write multiple
 09h WORD Base port address (1F0/170)
 0Bh BYTE Hardware interrupt channel (14/15)
SeeAlso: #00298
--------v-13EC00-----------------------------
INT 13 - VIRUS - "Tiso" - INSTALLATION CHECK
 AX = EC00h
Return: CF clear if installed
SeeAlso: AH=F2h,INT 12/AX=4350h/BX=4920h
--------d-13EE-------------------------------
INT 13 - SWBIOS - SET 1024-CYLINDER FLAG
 AH = EEh
 DL = drive number (80h, 81h)
Return: CF clear
    AH = 00h
Program: SWBIOS is a TSR by Ontrack Computer Systems
Desc: the following INT 13 call will add 1024 to the specified cylinder
   number to get the actual cylinder number desired
Notes: the flag is cleared by all INT 13 calls except AH=EEh and AH=EFh
 Disk Manager also supports these calls
 this function is also supported by HyperDisk v4.01+ and PC-Cache v5.5+,
   in order to allow caching of drives using SWBIOS to access more than
   1024 cylinders
 for software which supports that call, this function is equivalent to
   calling AH=EFh with CX=0400h
SeeAlso: AH=F9h,AH=FEh,INT 16/AX=FFA5h/CX=1111h,INT 2F/AX=DF00h
Index: PC-Cache;huge disks|Disk Manager
--------c-13EF-------------------------------
INT 13 - Ontrack Drive Rocket - SET CYLINDER OFFSET
 AH = EFh
 CX = cylinder offset for next INT 13 call
 DL = drive number (80h, 81h)
Return: CF clear
     AH = 00h
Program: Drive Rocket is a drive accelerator by Ontrack Computer Systems for
   IDE drives supporting the read multiple and write multiple commands
Desc: the following INT 13 call will add the number given by this call to
   the specified cylinder to get the actual cylinder number, then reset
   the offset to zero
Note: this function is also supported by the NOW! disk cache, and presumably
   newer versions of SWBIOS and Disk Manager
 for software which supports this call, AH=EEh is equivalent to calling
   this function with CX=0400h
 the cylinder offset is reset to 0 by all INT 13 called except AH=EEh
   and AH=EFh
SeeAlso: AX=7B00h
--------v-13F2-------------------------------
INT 13 - VIRUS - "Neuroquila" - INSTALLATION CHECK
 AH = F2h
Return: CF ??? if installed
SeeAlso: AX=EC00h,INT 12/AX=4350h/BX=4920h,INT 21/AX=0B56h
--------d-13F9-------------------------------
INT 13 - SWBIOS - INSTALLATION CHECK
 AH = F9h
 DL = drive number (80h,81h)
Return: CF clear
     DX = configuration word
  bit 15 set if other SWBIOS extensions available
 CF set on error
Program: SWBIOS is a TSR by Ontrack Computer Systems
 XBIOS is a driver in some versions of Disk Manager that is
   loaded from the disk MBR, replacing the ROM BIOS disk support
   eg adding LBA mode support, and read/write multiple.
Note: Disk Manager also supports these calls
SeeAlso: AH=EEh,AX=E000h"XBIOS",AH=FFh"EZ-Drive"
Index: Disk Manager
--------v-13FA--DX5945-----------------------
INT 13 - PC Tools v8+ VSAFE, VWATCH - API
 AH = FAh
 DX = 5945h
 AL = function (00h-07h)
Return: varies by function
 if not installed:
     CF set
  AH = 01h
Note: this API is identical to the ones on INT 16/AH=FAh and INT 21/AH=FAh,
   so it is listed in its entirety under INT 16/AX=FA00h and following
SeeAlso: INT 16/AX=FA00h
--------v-13FD50------------------------
INT 13 - VIRUS - "Predator" - INSTALLATION CHECK
 AX = FD50h
Return: AX = 50FDh if resident
SeeAlso: AX=5001h"VIRUS",INT 16/AH=DDh"VIRUS"
--------d-13FE-------------------------------
INT 13 - SWBIOS - GET EXTENDED CYLINDER COUNT
 AH = FEh
 DL = drive number (80h, 81h)
Return: CF clear
 DX = number of cylinders beyond 1024 on drive
Program: SWBIOS is a TSR by Ontrack Computer Systems
Notes: standard INT 13/AH=08h will return a cylinder count truncated to 1024
 BIOS without this extension would return count modulo 1024
 Disk Manager also supports these calls
SeeAlso: AH=EEh
----------13FF-------------------------------
INT 13 - EZ-Drive - INSTALLATION CHECK
 AH = FFh
 DL = drive number (80h)
Return: CF clear
     AX = AA55h
     ES:BX -> string "AERMH13Vxx", where xx is the version number of
    the EZ-Drive driver
 CF set on error
Program: EZ-Drive is a driver by Micro House that is loaded from the
   hard disk MBR, replacing the ROM BIOS disk support, eg adding
   LBA mode support, and read/write multiple.
Note: this function is called by the Windows95 Master Boot Record
SeeAlso: AX=E000h"XBIOS",AH=F9h"SWBIOS"
--------B-13FF-------------------------------
INT 13 - IBM SurePath BIOS - Officially "Private" Function
 AH = FFh
--------U-13FFFFBHAA-------------------------
INT 13 - UNIQUE UX Turbo Utility - SET TURBO MODE
 AX = FFFFh
 BH = AAh
 BL = subfunction
     00h installation check
  Return: AX = 1234h if installed
     01h turn on Turbo mode
     02h turn off Turbo mode
     03h set Turbo mode according to hardware switch
     04h set disk access to Turbo mode
     05h set disk access to Normal mode
Return: nothing
SeeAlso: INT 15/AH=DFh
Index: installation check;UNIQUE UX Turbo Utility