Int 15/AH=D4h

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Later PS/2s - GET PHYSICAL FIXED DISK DRIVE NUMBER (SELECTABLE BOOT)

AH = D4h
DL = logical fixed disk drive number

Return:
AH = return code (see #00537) CF set on error CF clear on success AL = physical fixed disk drive number

(Table 00537) Values for return code: 00h success 01h specified logical drive number is invalid 80h function not supported (on PCjr and PC) 86h function not supported

Category: Bios - Int 15h - L

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