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AH = 4Eh AL = function 00h enable prefetch 01h disable prefetch 02h set maximum PIO transfer mode 03h set PIO mode 0 04h set default PIO transfer mode 05h enable INT 13h DMA maximum mode 06h disable INT 13h DMA DL = drive number
Return:
CF clear if successful AH = 00h AL = status 00h command was safe (only affected specified drive) 01h other devices are affected CF set on error AH = error code (see #00234)
Note: DMA and PIO modes are mutually exclusive, so selecting DMA disables PIO (for either the specified device or all devices on that controller), and selecting PIO disables DMA
See Also: AH=41h"INT 13 Extensions" - AX=5001h"Enhanced Disk Drive"
Category: Disk I/O Enhancements - Int 13h - I
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