Commands:                               Sources and destinations:
    CHECKSUM  src  ON/OFF                   NUL - Bit bucket.
    CONNECT  src TO  dest                   TIR - Test interface rack.
    DEBUG                                   RPU - Remote processing unit.
    DISCONNECT  src  FROM  dest             488 - IEEE-488 interface.
    ECHO  dest  ON/OFF                      232 - RS-232C interface.
    FUNCTION  src  INPUT/OUTPUT/SPECIAL     CON - Console interface.
    HELP  {488}                             RIF - RPU interface task.
    MEMORY  start, stop
    REDIRECT  dest  TO  dest                         488
    RESET                                             |
    ROM                                               |
    RPU  src                                CON ------*----- 232
    SEND  src  TO  dest                               |
    SOURCE  src  AS  src                              |
    START  address                                   TIR
    STATUS
    TRACE  switch  ON/OFF


IEEE-488 System Controller Functions:
    ASC <ascii_data>                        TLK <talker>
    BIN <hex_data>                          Input
    DCL <device_list>                       LIS <listeners>
    GET <device_list>                       Output
    GTL <device_list>                       XFR <talker><listeners>
    IFC                                     SPL <device_list>
    LCL
    LLO
    RMT