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                      WIRING A 9-PIN RS232 CONNECTOR

Looking down on the F1 PCB, you will see the three sets of 4 pins for RJ-11
4-wire (telephone style) sockets marked as J1 i.e.

                    ___________________________________
                   |                                   |
                   |                   J1              |
                   |                         2         |
                   |     o  o      o  o      o  o      |
     <- 7805       |      o  o      o  o      o  o     |       MAX232 ->
                   |                          5  3     |
                   |___________________________________|

The markings 2,3,5 shown above refer to the  9-pin DIN RS232 connector pins
2(RxD),  3(TxD), and 5(gnd) respectively.   As the BUFFALO monitor performs
no serial  communications handshaking or  flow control, you need to connect
the following pins  on the 9-pin socket   to ensure that the  host computer
will ignore handshaking:

                   .  1(DCD) to 4(DTR) to 6(DSR)
                   .  7(RTS) to 8(CTS)

Note that pin 9 of the connector is not used.

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                      WIRING A 25-PIN RS232 CONNECTOR

Here is the annotated view looking down on the F1 PCB at J1 where important
RS232 connections are marked:

                    ___________________________________
                   |                                   |
                   |                   J1              |
                   |                         3         |
                   |     o  o      o  o      o  o      |
     <- 7805       |      o  o      o  o      o  o     |       MAX232 ->
                   |                          7  2     |
                   |___________________________________|

The markings 3,2,7 shown above refer to the 25-pin DIN RS232 connector pins
3(RxD),  2(TxD),  and 7(gnd) respectively.   Again,  as the BUFFALO monitor
performs no serial communications handshaking or flow  control, you need to
connect the following  pins on the 25-pin socket   to ensure that the  host
computer will also ignore handshaking:

                   .  8(DCD) to 20(DTR) to 6(DSR)
                   .  4(RTS) to 5(CTS)

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phillip@rmit.edu.au August 1996
[I built the 9-pin cable & inferred the connections for the 25-pin cable.]