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  Description:  Write Character to Printer      [PC] [AT]
 
  Sends a character to the specified parallel printer interface port and
  returns the current status of the port.
 
  Input                                  Output
  ═══════════════════════════            ═══════════════════════════════
  AH=00H                                 AH=status
  AL=character                              Bit(s)  Significance (if set)
  DX=printer number                         ══════  ═════════════════════
     (0=LPT1, 1=LPT2, 2=LPT3)               7       printer not busy
                                            6       printer acknowledge
                                            5       out of paper
                                            4       printer selected
                                            3       I/O error
                                            2       unused
                                            1       unused
                                            0       printer timed-out
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