INT 16H 11H: Query Extended Keyboard Status / Preview Key

                                                                   [XT] [AT]
 Expects: AH    11H
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 Returns: ZF    ZR = no keys in buffer
                NZ = key is ready
          AH    (if ZR) scan code
          AL    ASCII character code or extended ASCII keystroke
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    Info: This is identical to INT 16H 01H, except that it does not perform
          "extended key filtering" to map 101-key 'board keystrokes to
          84-key 'board equivalents.

See Also: INT 16H (BIOS keyboard services)
          BIOS Data Area
          ROM-BIOS Functions
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