package TERMINAL_IO is

  -- types and procedures needed to transmit and receive 8-bit data to
  --      the terminal
  -- intended to provide the type BYTE and entry points RS_READ and
  --      RS_WRITE needed to instantiate one of the generic protocol
  --	  packages of NETWORK_PROTOCOLS (q.v.)


  type BYTE is range 0..255 ;
    for BYTE'SIZE use 8 ;

  
  procedure TTY_READ ( C : out BYTE ;
                       GOT_ONE : out BOOLEAN ;
                       RETURN_AFTER : DURATION := 0.0 ) ;
  procedure TTY_WRITE ( C : BYTE ) ;
  procedure TTY_WRITE_FLUSH ;
  procedure TTY_RESTORE ;
    -- since Ada doesn't provide for automatic shutdown, the enclosing
    --	    program will have to call this entry point to undo anything
    --	    that was done to allow 8-bit data transfer

end TERMINAL_IO ;