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"