ZENITH DATA SYSTEMS

MULTIPORT I/O CARD

Card Type          Multi-I/O
Chipset/Controller Unidentified
I/O Options        Parallel, serial I/O via DB-37 port
Maximum DRAM       N/A

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                                CONNECTIONS

               Purpose                             Location

  Parallel and serial I/O DB-37 port                  CN1

                           SERIAL RECEIVE CLOCK

               » Setting                                J10

  »            External clock                    Pins 2 & 3 closed

  »            Internal clock                    Pins 1 & 2 closed

                           SERIAL TRANSMIT CLOCK

               » Setting                                J11

  »            External clock                    Pins 1 & 2 closed

  »            Internal clock                    Pins 2 & 3 closed

                       MISCELLANEOUS TECHNICAL NOTES

  The DB-37 port is designed to connect to a "breakout box" consisting of
        two DB-25 external connectors for parallel and serial I/O.