X-Hacker.org- Interrupts & Ports - check enhanced keystroke (at model 339,xt2,xt286,ps)

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        Check enhanced keystroke (AT model 339,XT2,XT286,PS)

        Entry:
          AH = 11h
        Return:
          ZF = 0 if keystroke available
            AH = scan code \ meaningless if ZF = 1
            AL = character /
          ZF = 1 if kbd buffer empty

See Also: INT 16h, 01h

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