X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 16 - keyboard

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INT 16 - KEYBOARD - CHECK BUFFER, DO NOT CLEAR
        AH = 01h
Return: ZF clear if character in buffer
            AH = scan code
            AL = character
        ZF set if no character in buffer
SeeAlso: AH=00h,11h

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