RBIL61 - INT 15 - later PS/2s - GET PHYSICAL FIXED DISK DRIVE NUMBER (SELECTABLE BOOT)

INT 15 - later PSIBM PS/2, any model/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 PCIBM PC)
 86h	function not supported