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"