int13.txt

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	  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 #0197)
	    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 supporte media type
Notes:	this function is supported by the 3/8/93 ROM BIOS, but only partially
	  (AL is always 00h when successful) by the 8/3/93 version
	this function is also supported by some recent versions of the Phoenix
	  486 BIOS

(Table 0197)
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 #0166 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
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 #0166 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 #0198)
	DL = drive number (80h,81h)
	???
Return: CF clear if successful
	CF set on error
	AH = status (see #0166 at AH=01h)
SeeAlso: AH=21h"PS/1",AH=22h"PS/1",AH=24h"PS/1",AH=25h"PS/1"

(Table 0198)
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: #P175
--------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 #0166 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 #0166 at AH=01h)
	buffer filled with ATA/IDE-style drive information block (see #0199)
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 0199)
 00h	WORD	general drive configuration (see #0200)
 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: #P157

Bitfields for general drive configuration:
Bit(s)	Description	(Table 0200)
 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 #0201)
	    01h drive info (see #0202)
	    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
	  As