Index for interrupt INT 4D

Table of Contents by Order
4D - INT 4D - Z100 - Slave 8259 - S100 vectored line 5
4D - INT 4D - IBM - M-Audio Adapter SUPPORT
4D00 - INT 4D - TI Professional PC - DISK - RESET DISK SYSTEM
4D01 - INT 4D - TI Professional PC - DISK - GET STATUS OF LAST OPERATION
4D02 - INT 4D - TI Professional PC - DISK - READ SECTOR(S) INTO MEMORY
4D03 - INT 4D - TI Professional PC - DISK - WRITE SECTOR(S) FROM MEMORY
4D04 - INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR CRC(S)
4D05 - INT 4D - TI Professional PC - DISK - NOP
4D06 - INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR(S)
4D07 - INT 4D - TI Professional PC - DISK - GET RETRY STATUS OF LAST OPERATION
4D08 - INT 4D - TI Professional PC - DISK - SET STANDARD DEVICE INTERFACE TABLE
4D09 - INT 4D - TI Professional PC - DISK - SET DEVICE INTERFACE TABLE ADDRESS
4D0A - INT 4D - TI Professional PC - DISK - GET DEVICE INTERFACE TABLE ADDRESS
4D0B - INT 4D - TI Professional PC - DISK - TURN OFF ALL DRIVES

INT 4D - Z100 - Slave 8259 - S100 vectored line 5
SeeAlso: INT 4C"Z100",INT 4E"Z100"

INT 4D - IBM - M-Audio Adapter SUPPORT
	no details available; supposedly documented in IBM form G571-0203-01

INT 4D - TI Professional PC - 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 at INT 13/AH=01h)
	CF clear if successful (returned AH=00h)
	CF set on error
Note:	this function is the same as INT 13/AH=00h on a standard PC BIOS
SeeAlso: AH=01h,AH=02h,AH=08h,AH=0Bh,INT 13/AH=00h,INT 46"TI Professional"
SeeAlso: INT 48/AH=00h"TI Professional",INT 4A/AH=00h"TI"

INT 4D - TI Professional PC - DISK - GET STATUS OF LAST OPERATION
	AH = 01h
	DL = drive (bit 7 set for hard disk)
Return: CF clear if status unchanged
	CF set if status changed since last call
	AH = 00h
	AL = status of previous operation (see #00234 at INT 13/AH=01h)
Notes:	this function is nearly the same as INT 13/AH=01h on a standard PC BIOS
	the TI's BIOS tranparently performs a number of retries, and an error
	  status is only reported if all of the retries fail.  To get the error
	  status if the operation succeeded on a retry, use AH=07h instead
SeeAlso: AH=00h,AH=07h,INT 13/AH=01h

INT 4D - TI Professional PC - 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 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
SeeAlso: AH=00h,AH=01h,AH=03h,AH=04h,INT 13/AH=02h

INT 4D - TI Professional PC - DISK - WRITE SECTOR(S) FROM MEMORY
	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 -> buffer containing data
Return: CF set on error
	    if AH = 11h (corrected ECC error), AL = burst length
	CF clear if successful
	AH = status (see #00234 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,INT 13/AH=03h

INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR CRC(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
Return: CF set on error
	    if AH = 11h (corrected ECC error), AL = burst length
	CF clear if successful
	AH = status (see #00234 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
Note:	even though no data is transferred, ES:BX must still be valid
SeeAlso: AH=00h,AH=01h,AH=02h,AH=06h,INT 13/AH=04h

INT 4D - TI Professional PC - DISK - NOP
	AH = 05h
Note:	on the TI Pro, FORMAT.COM contains direct port I/O commands to perform
	  disk formatting, rather than using the BIOS

INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR(S)
	AH = 06h
	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
Return: CF set on error
	    if AH = 11h (corrected ECC error), AL = burst length
	CF clear if successful
	AH = status (see #00234 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
Note:	even though no data is transferred, ES:BX must still be valid because
	  an actual comparison with disk data is performed, not just the CRC
	  check of the standard PC BIOS or INT 4D/AH=04h
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,INT 13/AH=04h

INT 4D - TI Professional PC - DISK - GET RETRY STATUS OF LAST OPERATION
	AH = 07h
	DL = drive (bit 7 set for hard disk)
Return: CF clear if status unchanged
	CF set if status changed since last call
	AH = 00h
	AL = status of previous operation (see #00234 at INT 13/AH=01h)
Notes:	this function is nearly the same as INT 13/AH=01h on a standard PC BIOS
	the TI's BIOS tranparently performs a number of retries; this function
	  returns the error status of a failed operation even if the operation
	  succeeded on a retry
SeeAlso: AH=00h,AH=01h,INT 13/AH=01h

INT 4D - TI Professional PC - DISK - SET STANDARD DEVICE INTERFACE TABLE
	AH = 08h
	DL = drive number (00h-03h)
	AL = drive type
	    00h single-sided 48 tpi (40-track, 8 sectors, 512 bytes/sector)
	    01h double-sided 48 tpi (40-track, 8 sectors, 512 bytes/sector)
	    02h single-sided 96 tpi (80-track, 8 sectors, 512 bytes/sector)
	    03h double-sided 96 tpi (80-track, 8 sectors, 512 bytes/sector)
Return: nothing???
SeeAlso: AH=00h,AH=09h

INT 4D - TI Professional PC - DISK - SET DEVICE INTERFACE TABLE ADDRESS
	AH = 09h
	DL = drive number (00h-07h)
	ES:BX -> Device Interface Table (see #03226)
Return: nothing???
SeeAlso: AH=00h,AH=08h,AH=0Ah,INT 1E

Format of TI Professional PC Device Interface Table:
Offset	Size	Description	(Table 03226)
 00h	DWORD	-> entry point for disk routine
 04h	WORD	bytes per sector
 06h	BYTE	sectors per track
 07h	BYTE	number of heads
 08h	BYTE	number of cylinders
 09h	BYTE	retry count
 0Ah	BYTE	precompensation start
SeeAlso: #01264 at INT 1E

INT 4D - TI Professional PC - DISK - GET DEVICE INTERFACE TABLE ADDRESS
	AH = 0Ah
	DL = drive number (00h-07h)
Return: AH = status
	ES:BX -> Device Interface Table (see #03226)
SeeAlso: AH=00h,AH=08h,AH=09h,INT 1E

INT 4D - TI Professional PC - DISK - TURN OFF ALL DRIVES
	AH = 0Bh
Return: AH = 00h
Note:	used for diagnostics or to conserve power
SeeAlso: AH=00h