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DEVICE DRIVER FUNCTIONS
All strategy routines are called with ES:BX pointing to the
request header. The interrupt routines get the pointers to the
request header from the queue the strategy routines store them
in. The command code in the request header tells the driver which
function to perform. NOTE: all DWORD pointers are stored offset
first, then segment.
The following function call parameters are described:
INIT
MEDIA CHECK
BUILD BPB (BIOS PARAMETER BLOCK)
MEDIA DESCRIPTOR BYTE
INPUT OR OUTPUT
NONDESTRUCTIVE INPUT NO WAIT
STATUS
FLUSH
OPEN OR CLOSE
REMOVABLE MEDIA |