INT 13 - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911./MS INT 13 Extensions v2.1+ - SET HARDWARE CONFIGURATION
	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 DMAsee Direct Memory Access maximum mode
	    06h disable INT 13h DMAsee Direct Memory Access
	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:	DMAsee Direct Memory Access and PIO modes are mutually exclusive, so selecting DMAsee Direct Memory Access disables
	  PIO (for either the specified device or all devices on that
	  controller), and selecting PIO disables DMAsee Direct Memory Access
SeeAlso: AH=41h"INT 13 Extensions",AX=5001h"Enhanced Disk Drive"