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Int 16 Fn 11 - Keyboard - Check For Enhanced Keystroke (enh Kbd Support [B]
AH = 11h
Return: ZF set if no keystroke available
ZF clear if keystroke available
AH = BIOS scan code
AL = ASCII character
Notes: if a keystroke is available, it is not removed from the keyboard buffer
unlike AH=01h, this function does not discard extended keystrokes
some versions of the IBM BIOS Technical Reference erroneously report
that CF is returned instead of ZF
INT 16/AH=09h can be used to determine whether this function is
supported, but only on later model PS/2s
See Also: AH=01h,AH=09h,AH=10h,AH=21h
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