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Int 16 Fn 01 - Keyboard - Check For Keystroke [B]
AH = 01h
Return: ZF set if no keystroke available
ZF clear if keystroke available
AH = BIOS scan code
AL = ASCII character
Note: if a keystroke is present, it is not removed from the keyboard buffer;
however, any extended keystrokes which are not compatible with 83/84-
key keyboards are removed in the process of checking whether a
non-extended keystroke is available
See Also: AH=00h,AH=11h,AH=21h,INT 18/AH=01h
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