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Int 15 Fn D4 - Later Ps/2s - Get Physical Fixed Disk Drive Number (selec [B]
AH = D4h
DL = logical fixed disk drive number
Return: AH = return code
00h success
01h specified logical drive number is invalid
86h function not supported
80h function not supported (on PCjr and PC)
CF set on error
CF clear on success
AL = physical fixed disk drive number
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