Int 21/AH=91h/CX=FFFFh

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PTS-DOS 6.51 & S/DOS 1.0 - DIRECT DISK WRITE

AH = 91h
CX = FFFFh (for partitions > 32 Mb)
DS:BX -> request block (see #04094)
CX = sector count (for partitions < 32 Mb)
DX = starting sector number
DS:BX -> buffer

Return:
CF set on error AX error code CF clear on success

Note: This function is supported by Paragon Technology Systems S/DOS 1.0 (and most probably by PTS-DOS 6.51, maybe even earlier).. To access big partitions (> 32 Mb), CX != FFFFh is not allowed and the buffer must always be used. Otherwise, the system will return error code 0207h.. It is currently unknown if this function is also supported by PhysTechSoft PTS-DOS 6.60, 6.70, or 2000.

See Also: INT 21/Ah=90h"PTS" - INT 25h - INT 26h

Category: Uncatagorized - Int 21h - P

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