INT 15 U - Toshiba laptops - SECURITY LEVEL CHECK AX = 44F1h DS:DX -> byte with 00h ??? Return: ??? Note: used by Toshiba BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. setup utility TSETUP.EXE to distinguish between USER and SUPERVISOR security level SeeAlso: AX=44F2h,AX=44F3h