INT 13H Extensions:
INT 13H (0x13)
Function 1BH (0x1B or 27) --> Get Manufacturing Header (ESDI Fixed Disk)
Call with: AH = 1BH
AL = number of sector(s) to read
DL = drive
ES: BX = buffer for manufacturing header
(defect list)
Returns: If function successful
Carry flag = clear
AH = 00H
If function unsuccessful
Carry flag = set
AH = status
Comments:
This function is used to get the manufacturing header of the fixed disk. 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. Manufacturing header format (Defect Map Record format) can be found in IBM 70MB, 115MB Fixed Disk Drives Technical Reference.
INT 13H (0x13)
Function 1BH (0x1B or 27) --> Get Pointer to SCSI Disk Information Block (Future Domain SCSI Controller)
Call with: AH = 1BH
DL = hard drive ID
Returns: If function successful
Carry flag = clear
AH = 01H
If function unsuccessful
Carry flag = set
AH = status
ES:BX = SCSI disk information block
Comments:
This function is used to get the pointer to SCSI Disk Information Block. This also sets a non-resettable flag which prevents some controller messages from being displayed.
INT 13H (0x13)
Function 1CH (0x1C or 28) --> Get Pointer to Free Controller Ram (Future Domain SCSI Controller)
Call with: AH = 1CH
DL = hard drive ID for any valid SCSI
hard disk
Returns: If function successful
Carry flag = clear
AH = 01H
If function unsuccessful
Carry flag = set
AH = status
ES:BX = first byte of free RAM on controller
Comments:
This function is used to get the free controller Ram. ES:BX points to the first byte of free RAM on the controller, available for other uses. ES contains the segment at which the controller resides. The two memory-mapped I/O ports of the controller are at offsets 1C00H and 1E00H.
INT 13H (0x13)
Function 1C08H (0x1C08) --> Get Command Completion Status (ESDI Fixed Disk)
Call with: AX = 1C08H
DL = drive
ES:BX = buffer for Command Complete
Status Block
Return: If function successful
Carry flag = clear
AH = 01H
If function unsuccessful
Carry flag = set
AH = status
Comments:
This Function is used to get the Command Completion Status. If the function is successful the carry flag is clear and if unsuccessful carry flag is set.
INT 13H (0x13)
Function 1C09H (0x1C09) --> Get Device Status (ESDI Fixed Disk)
Call with: AX = 1C09H
DL = drive
ES:BX = buffer for Device Status Block
Return: If function successful
Carry flag = clear
AH = 01H
If function unsuccessful
Carry flag = set
AH = status
Comments:
This Function is used to get the Device Status. If the function is successful the carry flag is clear and if unsuccessful carry flag is set.
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