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  Service 02H (decimal 2) receives one character from the communications
  line specified in DX and returns it in the AL register. The service waits
  for a character or any signal that indicates the completion of the
  service, such as a time-out. AH reports the success or failure of the
  service in bit 7, as explained in the discussion of service 01H. Again,
  consider the advice under service 01H for error handling and see service
  03H for the error codes.