INT 48 - KEYBOARD - CORDLESS KEYBOARD TRANSLATION (PCjr) AL = scan code??? Note: This interrupt may be un-initialized (0000h:0000h) on old machines. This should be checked before calling or hooking this vector. MS-DOS/PC DOS 3.3x-4.x KEYB hooked the INT 48h handler. For AL <= 80h it checked that either ALT and neither CTRL key was pressed, and in that case, it cleared the CTRL flag in the BIOS variable at 0040:0017h and stored its contents in an internal variable, before continuing with the previous (non-zero) INT 48h handler. SeeAlso: INT 49"PCjr"