INT 16 U - PCIBM PC Tools v5.1-8.0 DESKTOP - CHECK FOR AND GET KEYSTROKE AX = FFE6h Return: AX = 0000h if no key available else 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. keycode Notes: available only when popped up invokes INT 28 idle interrupt before checking for key