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

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INT 16 - KEYBOARD - READ CHAR FROM BUFFER, WAIT IF EMPTY
        AH = 00h
Return: AH = scan code
        AL = character
Note:   on extended keyboards, this function discards any extended keystrokes,
          returning only when a non-extended keystroke is available
SeeAlso: AH=01h,10h

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