BRAIN BOXES
===========

   AT DUAL PORT RS422/485 (OPTO ISOLATED)

   Card Type           Serial card                                
   Chip Set            Unidentified                               
   Data Bus            8-bit ISA                                  

<gopher://bitreich.org/I/th99/i/A-B/53935-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |      Function       | Label |       Function       | Label |
   |---------------------+-------+----------------------+-------|
   | 9-pin serial port 1 |  CN1  | 26-pin parallel port |  CN3  |
   |                     |       | - internal           |       |
   |---------------------+-------+----------------------+-------|
   | 9-pin serial port 2 |  CN2  |                      |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Label |  Position  |
   |---------------------------------------+-------+------------|
   |>> | Serial port 1 half duplex gate    |  J5A  | Pins 1 & 2 |
   |   | disabled                          |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Serial port 1 half duplex gate    |  J5A  | Pins 2 & 3 |
   |   | enabled when RTS true             |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Serial port 1 half duplex RTS     |  J5B  | Pins 1 & 2 |
   |   | disabled                          |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Serial port 1 half duplex RTS     |  J5B  | Pins 2 & 3 |
   |   | enabled                           |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Serial port 1 half duplex CTS1    |  J5C  | Pins 1 & 2 |
   |   | disabled                          |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Serial port 1 half duplex CTS1    |  J5C  | Pins 2 & 3 |
   |   | enabled                           |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Serial port 2 half duplex gate    |  J6A  | Pins 1 & 2 |
   |   | disabled                          |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Serial port 2 half duplex gate    |  J6A  | Pins 2 & 3 |
   |   | enabled when RTS true             |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Serial port 2 half duplex RTS     |  J6B  | Pins 1 & 2 |
   |   | disabled                          |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Serial port 2 half duplex RTS     |  J6B  | Pins 2 & 3 |
   |   | enabled                           |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |>> | Serial port 2 half duplex CTS1    |  J6C  | Pins 1 & 2 |
   |   | disabled                          |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Serial port 2 half duplex CTS1    |  J6C  | Pins 2 & 3 |
   |   | enabled                           |       |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               SERIAL PORT ADDRESS SELECTION                |
   |------------------------------------------------------------|
   |    Setting     |      J2 Port 1      |      J2 Port 2      |
   |----------------+---------------------+---------------------|
   |      COM1      |  Pins 1 & 2 closed  |  Pins 2 & 3 closed  |
   |----------------+---------------------+---------------------|
   |      COM2      |  Pins 4 & 5 closed  |  Pins 5 & 6 closed  |
   |----------------+---------------------+---------------------|
   |      COM3      |  Pins 7 & 8 closed  |  Pins 8 & 9 closed  |
   |----------------+---------------------+---------------------|
   |      COM4      | Pins 10 & 11 closed | Pins 11 & 12 closed |
   |----------------+---------------------+---------------------|
   |      COM5      | Pins 13 & 14 closed | Pins 14 & 15 closed |
   |----------------+---------------------+---------------------|
   |      COM6      | Pins 16 & 17 closed | Pins 17 & 18 closed |
   |----------------+---------------------+---------------------|
   |      COM7      | Pins 19 & 20 closed | Pins 20 & 21 closed |
   |----------------+---------------------+---------------------|
   |      COM8      | Pins 22 & 23 closed | Pins 23 & 24 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 1 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |            IRQ             |              J3               |
   |----------------------------+-------------------------------|
   |    |         IRQ2          |      Pins 11 & 12 closed      |
   |----+-----------------------+-------------------------------|
   |>>  |         IRQ3          |      Pins 9 & 10 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ4          |       Pins 7 & 8 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ5          |       Pins 5 & 6 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ6          |       Pins 3 & 4 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ7          |       Pins 1 & 2 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ10         |      Pins 13 & 14 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ11         |      Pins 15 & 16 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ12         |      Pins 17 & 18 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ14         |      Pins 19 & 20 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ15         |      Pins 21 & 22 closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 2 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |            IRQ             |              J4               |
   |----------------------------+-------------------------------|
   |    |         IRQ2          |      Pins 11 & 12 closed      |
   |----+-----------------------+-------------------------------|
   |>>  |         IRQ3          |      Pins 9 & 10 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ4          |       Pins 7 & 8 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ5          |       Pins 5 & 6 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ6          |       Pins 3 & 4 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ7          |       Pins 1 & 2 closed       |
   |----+-----------------------+-------------------------------|
   |    |         IRQ10         |      Pins 13 & 14 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ11         |      Pins 15 & 16 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ12         |      Pins 17 & 18 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ14         |      Pins 19 & 20 closed      |
   |----+-----------------------+-------------------------------|
   |    |         IRQ15         |      Pins 21 & 22 closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 1 MULTIPLEX SELECTION              |
   |------------------------------------------------------------|
   |             Setting              |           J7            |
   |----------------------------------+-------------------------|
   |>> |      Multiplex disabled      |    Pins 1 & 3, 2 & 4    |
   |   |                              |         closed          |
   |---+------------------------------+-------------------------|
   |   |     Signal transmitted &     |    Pins 3 & 5, 4 & 6    |
   |   |           received           |         closed          |
   |---+------------------------------+-------------------------|
   |   |   Signals shorted together   |    Pins 3 & 5, 4 & 6    |
   |   |                              |         closed          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 2 MULTIPLEX SELECTION              |
   |------------------------------------------------------------|
   |             Setting              |           J8            |
   |----------------------------------+-------------------------|
   |>> |      Multiplex disabled      |    Pins 1 & 3, 2 & 4    |
   |   |                              |         closed          |
   |---+------------------------------+-------------------------|
   |   |     Signal transmitted &     |    Pins 3 & 5, 4 & 6    |
   |   |           received           |         closed          |
   |---+------------------------------+-------------------------|
   |   |   Signals shorted together   |    Pins 3 & 5, 4 & 6    |
   |   |                              |         closed          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  PARALLEL PORT SELECTION                   |
   |------------------------------------------------------------|
   |  Setting   | J1/pins 1 & 2 | J1/pins 3 & 4 | J1/pins 5 & 6 |
   |------------+---------------+---------------+---------------|
   |   |  LPT1  |     Open      |     Open      |    Closed     |
   |---+--------+---------------+---------------+---------------|
   |   |  LPT2  |     Open      |    Closed     |     Open      |
   |---+--------+---------------+---------------+---------------|
   |>> |  LPT3  |    Closed     |     Open      |     Open      |
   +------------------------------------------------------------+