DECISION COMPUTER INTERNATIONAL CO., LTD.
=========================================

   PCCOM 8-BIT ISA 2-PORT RS422/485

   Card Type         Serial                                       
   Chipset           Unidentified                                 
   I/O Options       Serial ports (2)                             
   Data Bus          8-bit ISA                                    

<gopher://bitreich.org/I/th99/i/C-D/52586-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                 |      Label      |
   |------------------------------------------+-----------------|
   | Serial ports via DB-37 port              |       CH1       |
   |------------------------------------------------------------|
   |      Note:Standard DB-25 serial ports are provided on an   |
   |      included adapter cable.                               |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   SERIAL PORT ADDRESSES                    |
   |------------------------------------------------------------|
   |  Port 1 Address  | Port 2 Address |          JP7           |
   |------------------+----------------+------------------------|
   |>> | 3F8h (COM1:) |  2F8h (COM2:)  |   Pins 1 & 3, 2 & 4    |
   |   |              |                |         closed         |
   |---+--------------+----------------+------------------------|
   |   | 3E8h (COM3:) |  2E8h (COM4:)  |   Pins 1 & 3 closed    |
   |---+--------------+----------------+------------------------|
   |   |     1A0h     |      1A8h      |   Pins 2 & 4 closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      PORT 1 INTERRUPT                      |
   |------------------------------------------------------------|
   | Setting  | JP5/A  | JP5/B  | JP5/C | JP5/D | JP5/E | JP5/F |
   |----------+--------+--------+-------+-------+-------+-------|
   |   | IRQ2 |  Open  |  Open  | Open  | Open  | Open  | Pins  |
   |   |      |        |        |       |       |       | 2 & 3 |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ3 |  Open  |  Open  | Open  | Open  | Pins  | Open  |
   |   |      |        |        |       |       | 2 & 3 |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |>> | IRQ4 |  Open  |  Open  | Open  | Pins  | Open  | Open  |
   |   |      |        |        |       | 2 & 3 |       |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ5 |  Open  |  Open  | Pins  | Open  | Open  | Open  |
   |   |      |        |        | 2 & 3 |       |       |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ6 |  Open  | Pins 2 | Open  | Open  | Open  | Open  |
   |   |      |        |  & 3   |       |       |       |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ7 | Pins 2 |  Open  | Open  | Open  | Open  | Open  |
   |   |      |  & 3   |        |       |       |       |       |
   |------------------------------------------------------------|
   |      Note:Pins designated are in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      PORT 2 INTERRUPT                      |
   |------------------------------------------------------------|
   | Setting  | JP5/A  | JP5/B  | JP5/C | JP5/D | JP5/E | JP5/F |
   |----------+--------+--------+-------+-------+-------+-------|
   |   | IRQ2 |  Open  |  Open  | Open  | Open  | Open  | Pins  |
   |   |      |        |        |       |       |       | 1 & 2 |
   |---+------+--------+--------+-------+-------+-------+-------|
   |>> | IRQ3 |  Open  |  Open  | Open  | Open  | Pins  | Open  |
   |   |      |        |        |       |       | 1 & 2 |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ4 |  Open  |  Open  | Open  | Pins  | Open  | Open  |
   |   |      |        |        |       | 1 & 2 |       |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ5 |  Open  |  Open  | Pins  | Open  | Open  | Open  |
   |   |      |        |        | 1 & 2 |       |       |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ6 |  Open  | Pins 1 | Open  | Open  | Open  | Open  |
   |   |      |        |  & 2   |       |       |       |       |
   |---+------+--------+--------+-------+-------+-------+-------|
   |   | IRQ7 | Pins 1 |  Open  | Open  | Open  | Open  | Open  |
   |   |      |  & 2   |        |       |       |       |       |
   |------------------------------------------------------------|
   |      Note:Pins designated are in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   PORT 1 TRANSMIT DRIVER                   |
   |------------------------------------------------------------|
   |             Setting             | JP1/A  | JP1/B  | JP1/C  |
   |---------------------------------+--------+--------+--------|
   |            Always on            | Closed |  Open  |  Open  |
   |---------------------------------+--------+--------+--------|
   |       Follows RTS signal        |  Open  | Closed |  Open  |
   |---------------------------------+--------+--------+--------|
   |    Follows bit 0 of control     |  Open  |  Open  | Closed |
   |            register             |        |        |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   PORT 2 TRANSMIT DRIVER                   |
   |------------------------------------------------------------|
   |             Setting             | JP2/A  | JP2/B  | JP2/C  |
   |---------------------------------+--------+--------+--------|
   |            Always on            | Closed |  Open  |  Open  |
   |---------------------------------+--------+--------+--------|
   |       Follows RTS signal        |  Open  | Closed |  Open  |
   |---------------------------------+--------+--------+--------|
   |    Follows bit 0 of control     |  Open  |  Open  | Closed |
   |            register             |        |        |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   PORT 1 RECEIVE DRIVER                    |
   |------------------------------------------------------------|
   |              Setting              |          JP3           |
   |-----------------------------------+------------------------|
   |             Always on             |   Pins 1 & 3 closed    |
   |-----------------------------------+------------------------|
   | Follows bit 1 of control register |   Pins 2 & 4 closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   PORT 2 RECEIVE DRIVER                    |
   |------------------------------------------------------------|
   |              Setting              |          JP4           |
   |-----------------------------------+------------------------|
   |             Always on             |   Pins 1 & 3 closed    |
   |-----------------------------------+------------------------|
   | Follows bit 1 of control register |   Pins 2 & 4 closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        WAIT STATES                         |
   |------------------------------------------------------------|
   | Setting  |  JP6/A  |  JP6/B  |  JP6/C  |  JP6/D  |  JP6/E  |
   |----------+---------+---------+---------+---------+---------|
   |    0     | Closed  |  Open   |  Open   |  Open   |  Open   |
   |----------+---------+---------+---------+---------+---------|
   |    1     |  Open   | Closed  |  Open   |  Open   |  Open   |
   |----------+---------+---------+---------+---------+---------|
   |    2     |  Open   |  Open   | Closed  |  Open   |  Open   |
   |----------+---------+---------+---------+---------+---------|
   |    3     |  Open   |  Open   |  Open   | Closed  |  Open   |
   |----------+---------+---------+---------+---------+---------|
   |    4     |  Open   |  Open   |  Open   |  Open   | Closed  |
   +------------------------------------------------------------+