MULTITECH SYSTEMS, INC.
=======================

   ISI508U

   Card Type          Serial card                                 
   Chipset Controller N/A                                         
   I/O Options        Serial ports (8 on external panel)          
   Maximum DRAM       N/A                                         

<gopher://bitreich.org/I/th99/i/M-O/51005-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |            Purpose            |          Location          |
   |-------------------------------+----------------------------|
   | 78-pin serial port connector  |            CN1             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 I/O BASE ADDRESS SELECTION                 |
   |------------------------------------------------------------|
   |Address |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5|SW1/6|SW1/7|SW1/8|
   |--------+------+------+------+------+-----+-----+-----+-----|
   |>> |380h |  On  |  On  |  On  |  On  | Off | Off | Off | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |100h |  On  |  On  |  On  |  On  | On  | Off | On  | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |108h | Off  |  On  |  On  |  On  | On  | Off | On  | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |110h |  On  | Off  |  On  |  On  | On  | Off | On  | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |118h | Off  | Off  |  On  |  On  | On  | Off | On  | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |120h |  On  |  On  | Off  |  On  | On  | Off | On  | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |3D8h | Off  | Off  |  On  | Off  | Off | Off | Off | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |3E0h |  On  |  On  | Off  | Off  | Off | Off | Off | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |3E8h | Off  |  On  | Off  | Off  | Off | Off | Off | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |3F0h |  On  | Off  | Off  | Off  | Off | Off | Off | On  |
   |--+-----+------+------+------+------+-----+-----+-----+-----|
   |  |3F8h | Off  | Off  | Off  | Off  | Off | Off | Off | On  |
   |------------------------------------------------------------|
   |  Note:A total of 96 base address settings are available.   |
   |  The switches are a binary representation of the decimal   |
   |  memory addresses. Switch SW1/8 is the Most Significant Bit|
   |  and switch SW1/1 is the Least Significant Bit. The        |
   |  switches have the following decimal values: switch        |
   |  SW1/1=8, SW1/2=16, SW1/3=32, SW1/4=64, SW1/5=128,         |
   |  SW1/6=256, SW1/7=512, SW1/8=1024. Turn off the switches   |
   |  and add the values of the switches that are off to obtain |
   |  the correct memory address. (Off=1, On=0)                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    INTERRUPT SELECTION                     |
   |------------------------------------------------------------|
   | IRQ   |  J1/A  |  J1/B  |  J1/C  |  J1/D  |  J1/E  | J1/F  |
   |-------+--------+--------+--------+--------+--------+-------|
   |>>|  3  |  Open  | Closed |  Open  |  Open  |  Open  | Open  |
   |-+-----+--------+--------+--------+--------+--------+-------|
   | | 2/9 | Closed |  Open  |  Open  |  Open  |  Open  | Open  |
   |-+-----+--------+--------+--------+--------+--------+-------|
   | |  4  |  Open  |  Open  | Closed |  Open  |  Open  | Open  |
   |-+-----+--------+--------+--------+--------+--------+-------|
   | |  5  |  Open  |  Open  |  Open  | Closed |  Open  | Open  |
   |-+-----+--------+--------+--------+--------+--------+-------|
   | |  6  |  Open  |  Open  |  Open  |  Open  | Closed | Open  |
   |-+-----+--------+--------+--------+--------+--------+-------|
   | |  7  |  Open  |  Open  |  Open  |  Open  |  Open  |Closed |
   +------------------------------------------------------------+