CHASE RESEARCH, INC.
====================

   CHASE IOXTRA

   Card Type           Serial card                                
   Chip Set            Unidentified                               
   I/O Options         Serial ports (2)                           
   Card Size           Half-length, full-height                   
   Data Bus            8-bit ISA                                  

<gopher://bitreich.org/I/th99/i/C-D/54575-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |      Function       | Label |      Function       | Label  |
   |---------------------+-------+---------------------+--------|
   | Serial port A       |  CN1  | Serial port B       |  CN2   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Function            | Label |     Position      |
   |--------------------------------+-------+-------------------|
   | Serial port A enabled          |  J4   | Pins 2 & 3 closed |
   |--------------------------------+-------+-------------------|
   | Serial port A disabled         |  J4   | Pins 1 & 2 closed |
   |--------------------------------+-------+-------------------|
   | Serial port B enabled          |  J5   | Pins 2 & 3 closed |
   |--------------------------------+-------+-------------------|
   | Serial port B disabled         |  J5   | Pins 1 & 2 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         CLOCK SET                          |
   |------------------------------------------------------------|
   |Clock |  J1/A  |  J1/B  |  J1/C  |  J1/D  |  J1/E  |  J1/F  |
   |------+--------+--------+--------+--------+--------+--------|
   | 2C0  | Closed |  Open  |  Open  |  Open  |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | 2C8  |  Open  | Closed |  Open  |  Open  |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | 2D0  |  Open  |  Open  | Closed |  Open  |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | 2D8  |  Open  |  Open  |  Open  | Closed |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | 3C0  |  Open  |  Open  |  Open  |  Open  | Closed |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | 3C8  |  Open  |  Open  |  Open  |  Open  |  Open  | Closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT A ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |           Setting           |              J7              |
   |-----------------------------+------------------------------|
   |            COM1             |   Pins 1 & 3, 2 & 4 closed   |
   |-----------------------------+------------------------------|
   |            COM3             |   Pins 1 & 3, 4 & 6 closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT B ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |           Setting           |              J6              |
   |-----------------------------+------------------------------|
   |            COM2             |   Pins 3 & 5, 2 & 4 closed   |
   |-----------------------------+------------------------------|
   |            COM4             |   Pins 3 & 5, 4 & 6 closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT A INTERRUPT SETTINGS              |
   |------------------------------------------------------------|
   |  IRQ  |    J2/A     |    J2/B    |    J2/C    |    J2/D    |
   |-------+-------------+------------+------------+------------|
   |   3   |   Closed    |    Open    |    Open    |    Open    |
   |-------+-------------+------------+------------+------------|
   |   4   |    Open     |   Closed   |    Open    |    Open    |
   |-------+-------------+------------+------------+------------|
   |   5   |    Open     |    Open    |   Closed   |    Open    |
   |-------+-------------+------------+------------+------------|
   |   9   |    Open     |    Open    |    Open    |   Closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT B INTERRUPT SETTINGS              |
   |------------------------------------------------------------|
   |  IRQ  |    J3/A     |    J3/B    |    J3/C    |    J3/D    |
   |-------+-------------+------------+------------+------------|
   |   3   |   Closed    |    Open    |    Open    |    Open    |
   |-------+-------------+------------+------------+------------|
   |   4   |    Open     |   Closed   |    Open    |    Open    |
   |-------+-------------+------------+------------+------------|
   |   5   |    Open     |    Open    |   Closed   |    Open    |
   |-------+-------------+------------+------------+------------|
   |   9   |    Open     |    Open    |    Open    |   Closed   |
   +------------------------------------------------------------+