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

   IPC8255/8254

   Card Type         Data acquisition                             
   Chipset           8254/8255                                    
   I/O Options       Digital I/O lines (24)                       
   Data Bus          IPCCPU expansion bus                         

<gopher://bitreich.org/I/th99/i/C-D/53180-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Function       | Label |      Function       | Label |
   |----------------------+-------+---------------------+-------|
   | IPCCPU expansion bus |  P1   | 8254 clock signals  |  P3   |
   |                      |       | (see pinout below)  |       |
   |----------------------+-------+---------------------+-------|
   | 8255 digital I/O     |  P2   | Unidentified        |  P4   |
   | lines 1-24 (see      |       |                     |       |
   | pinout below)        |       |                     |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         P2 PINOUT                          |
   |------------------------------------------------------------|
   |       Function        | Pin  |       Function       | Pin  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 0       |  1   | Channel 1 bit 5      |  14  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 1       |  2   | Channel 1 bit 6      |  15  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 2       |  3   | Channel 1 bit 7      |  16  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 3       |  4   | Channel 2 bit 0      |  17  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 4       |  5   | Channel 2 bit 1      |  18  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 5       |  6   | Channel 2 bit 2      |  19  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 6       |  7   | Channel 2 bit 3      |  20  |
   |-----------------------+------+----------------------+------|
   | Channel 0 bit 7       |  8   | Channel 2 bit 4      |  21  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 0       |  9   | Channel 2 bit 5      |  22  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 1       |  10  | Channel 2 bit 6      |  23  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 2       |  11  | Channel 2 bit 7      |  24  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 3       |  12  | Ground               |  25  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 4       |  13  | +5V DC power         |  26  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         P3 PINOUT                          |
   |------------------------------------------------------------|
   |       Function        | Pin  |       Function       | Pin  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 0       |  1   | Clock signal 1 in    |  8   |
   |-----------------------+------+----------------------+------|
   | Clock signal 0 in     |  2   | Channel 1 bit 4      |  9   |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 1       |  3   | Gate signal 1 out    |  10  |
   |-----------------------+------+----------------------+------|
   | Gate signal 0 out     |  4   | Channel 1 bit 5      |  11  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 2       |  5   | Clock signal 1 out   |  12  |
   |-----------------------+------+----------------------+------|
   | Clock signal 0 out    |  6   | Channel 1 bit 6      |  13  |
   |-----------------------+------+----------------------+------|
   | Channel 1 bit 3       |  7   | Clock signal 2 in    |  14  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     P3 PINOUT (CON'T)                      |
   |------------------------------------------------------------|
   |          Function           | Pin |     Function     | Pin |
   |-----------------------------+-----+------------------+-----|
   | Channel 1 bit 7             | 15  | 4.9152MHz clock  | 21  |
   |                             |     | signal           |     |
   |-----------------------------+-----+------------------+-----|
   | Gate signal 2 out           | 16  | Inverse of clock | 22  |
   |                             |     | signal 1 out     |     |
   |-----------------------------+-----+------------------+-----|
   | TO1 signal                  | 17  | 2.4576MHz clock  | 23  |
   |                             |     | signal           |     |
   |-----------------------------+-----+------------------+-----|
   | Clock signal 2 out          | 18  | Inverse of clock | 24  |
   |                             |     | signal 2 out     |     |
   |-----------------------------+-----+------------------+-----|
   | 9.8304MHz clock signal      | 19  | Ground           | 25  |
   |-----------------------------+-----+------------------+-----|
   | Inverse of clock signal 0   | 20  | +5V DC power     | 26  |
   | out                         |     |                  |     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Setting             | Label |     Position      |
   |--------------------------------+-------+-------------------|
   |>> | Card is first card         |  JP2  | Pins 3 & 4 closed |
   |---+----------------------------+-------+-------------------|
   |   | Card is second card        |  JP2  | Pins 1 & 2 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 BASE I/O ADDRESS SELECTION                 |
   |------------------------------------------------------------|
   | Setting  |  JP1/A  |  JP1/B  |  JP1/C  |  JP1/D  |  JP1/E  |
   |----------+---------+---------+---------+---------+---------|
   |   | 90h  | Closed  |  Open   |  Open   |  Open   |  Open   |
   |---+------+---------+---------+---------+---------+---------|
   |   | A0h  |  Open   | Closed  |  Open   |  Open   |  Open   |
   |---+------+---------+---------+---------+---------+---------|
   |>> | B0h  |  Open   |  Open   | Closed  |  Open   |  Open   |
   |---+------+---------+---------+---------+---------+---------|
   |   | C0h  |  Open   |  Open   |  Open   | Closed  |  Open   |
   |---+------+---------+---------+---------+---------+---------|
   |   | E0h  |  Open   |  Open   |  Open   |  Open   | Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CLOCK 0 RATE SELECTION                   |
   |------------------------------------------------------------|
   |      Setting      |    JP3/A    |    JP3/B    |   JP3/C    |
   |-------------------+-------------+-------------+------------|
   |>> |   2.4576MHz   |    Open     |    Open     |   Closed   |
   |---+---------------+-------------+-------------+------------|
   |   |   4.9152MHz   |    Open     |   Closed    |    Open    |
   |---+---------------+-------------+-------------+------------|
   |   |   9.8304MHz   |   Closed    |    Open     |    Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CLOCK 1 RATE SELECTION                   |
   |------------------------------------------------------------|
   |      Setting      |    JP4/A    |    JP4/B    |   JP4/C    |
   |-------------------+-------------+-------------+------------|
   |>> |   2.4576MHz   |    Open     |    Open     |   Closed   |
   |---+---------------+-------------+-------------+------------|
   |   |   4.9152MHz   |    Open     |   Closed    |    Open    |
   |---+---------------+-------------+-------------+------------|
   |   |   9.8304MHz   |   Closed    |    Open     |    Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CLOCK 2 RATE SELECTION                   |
   |------------------------------------------------------------|
   |      Setting      |    JP5/A    |    JP5/B    |   JP5/C    |
   |-------------------+-------------+-------------+------------|
   |>> |   2.4576MHz   |    Open     |    Open     |   Closed   |
   |---+---------------+-------------+-------------+------------|
   |   |   4.9152MHz   |    Open     |   Closed    |    Open    |
   |---+---------------+-------------+-------------+------------|
   |   |   9.8304MHz   |   Closed    |    Open     |    Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   | This card is designed to be used with Decision Computer    |
   | International Co., Ltd.'s IPCCPU board. See this document  |
   | for more information.                                      |
   +------------------------------------------------------------+