DTK COMPUTER, INC.
==================

   RS-232 DUAL I/O SHORT CARD

   Card Type              Serial card                             
   Chip Set               Unidentified                            
   Maximum Onboard Memory Unidentified                            
   I/O Options            Serial ports (2)                        
   Data Bus               8-bit ISA                               

<gopher://bitreich.org/I/th99/i/C-D/54498-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Function       | Label |      Function       | Label |
   |----------------------+-------+---------------------+-------|
   | Serial port 1        |  J1   | Serial port 2       |  J2   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 1 ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |   Setting   |  S1/1   |  S1/2   |  S1/3  |  S1/4  |  S1/5  |
   |-------------+---------+---------+--------+--------+--------|
   | COM1 (3F8h) |   On    |   Off   |  Off   |  Off   |   On   |
   |-------------+---------+---------+--------+--------+--------|
   | COM2 (3E8h) |   Off   |   Off   |  Off   |  Off   |  Off   |
   |-------------+---------+---------+--------+--------+--------|
   | COM3        |   Off   |   Off   |   On   |   On   |  Off   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |        SERIAL PORT 1 ADDRESS SELECTION (CONTINUED)         |
   |------------------------------------------------------------|
   |    Setting    |  S1/6  |  S1/7  |  S1/8  |  S1/9  | S1/10  |
   |---------------+--------+--------+--------+--------+--------|
   | COM1 (3F8h)   |  Off   |  Off   |  Off   |  Off   |  Off   |
   |---------------+--------+--------+--------+--------+--------|
   | COM2 (3E8h)   |   On   |  Off   |  Off   |   On   |  Off   |
   |---------------+--------+--------+--------+--------+--------|
   | COM3          |  Off   |  Off   |  Off   |  Off   |  Off   |
   |------------------------------------------------------------|
   | Note: In order to use COM3, you must program COM3 into     |
   | your software. Switches 5 & 6, 7 & 8 specify the IRQ       |
   | selection. See tables below for specific information.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 2 ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |   Setting   |  S1/1   |  S1/2   |  S1/3  |  S1/4  |  S1/5  |
   |-------------+---------+---------+--------+--------+--------|
   | COM1 (2F8h) |   Off   |   Off   |  Off   |  Off   |  Off   |
   |-------------+---------+---------+--------+--------+--------|
   | COM2 (2E8h) |   On    |   On    |  Off   |  Off   |   On   |
   |-------------+---------+---------+--------+--------+--------|
   |    COM4     |   Off   |   Off   |   On   |   On   |  Off   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |          SERIAL PORT 2 ADDRESS SELECTION (CON'T)           |
   |------------------------------------------------------------|
   |      Setting      | S1/6  | S1/7  | S1/8  | S1/9  | S1/10  |
   |-------------------+-------+-------+-------+-------+--------|
   |    | COM1 (2F8h)  |  On   |  On   |  Off  |  On   |   On   |
   |----+--------------+-------+-------+-------+-------+--------|
   |>>  | COM2 (2E8h)  |  Off  |  Off  |  On   |  Off  |  Off   |
   |----+--------------+-------+-------+-------+-------+--------|
   |    | COM4         |  Off  |  Off  |  Off  |  Off  |  Off   |
   |------------------------------------------------------------|
   | Note: In order to use COM4, you must program COM4 into     |
   | your software.                                             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 1 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |      IRQ      |     COM      |     S1/5     |     S1/6     |
   |---------------+--------------+--------------+--------------|
   |     IRQ3      |     COM2     |     Off      |      On      |
   |---------------+--------------+--------------+--------------|
   |     IRQ4      |     COM1     |      On      |     Off      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 2 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |      IRQ      |     COM      |     S1/7     |     S1/8     |
   |---------------+--------------+--------------+--------------|
   |     IRQ3      |     COM2     |     Off      |      On      |
   |---------------+--------------+--------------+--------------|
   |     IRQ4      |     COM1     |      On      |     Off      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   | If your system already has a serial port then you will use |
   | the settings for serial port 1. This will enable only one  |
   | port in the RS-232 board. If your system does not have any |
   | aerial ports, you will have to use the settings for serial |
   | port 2. This will enable both ports on the RS-232 board.   |
   | To use the ports as COM3 and COM4, you will need to write  |
   | software to support this function. Switch settings are     |
   | provided.                                                  |
   +------------------------------------------------------------+