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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.
See Also: INT 49"PCjr"
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