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       # DECISION COMPUTER INTERNATIONAL CO., LTD.
       
          8255/8253 I/O CARD
       
          Card Type         Data acquisition                             
          Chip Set          NEC 8255                                     
          I/O Options       Digital I/O ports (2)                        
          Data Bus          8-bit ISA                                    
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |       Function       | Label |      Function       | Label |
          |----------------------+-------+---------------------+-------|
          | Digital I/O port 1   |  CN1  | Digital I/O port 2  |  CN2  |
          | (see pinout below)   |       | (see pinout below)  |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         CN1 PINOUT                         |
          |------------------------------------------------------------|
          |        Function        | Pin  |      Function       | Pin  |
          |------------------------+------+---------------------+------|
          | Ground                 |  1   | Channel 1C bit 6    |  21  |
          |------------------------+------+---------------------+------|
          | Ground                 |  2   | Channel 1C bit 7    |  22  |
          |------------------------+------+---------------------+------|
          | Ground                 |  3   | Channel 1C bit 4    |  23  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 3       |  4   | Channel 1C bit 5    |  24  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 1       |  5   | Channel 1C bit 1    |  25  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 2       |  6   | Channel 1C bit 0    |  26  |
          |------------------------+------+---------------------+------|
          | Clock signal 0 in      |  7   | Channel 1B bit 7    |  27  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 0       |  8   | Channel 1C bit 2    |  28  |
          |------------------------+------+---------------------+------|
          | Gate signal 0          |  9   | Channel 1B bit 6    |  29  |
          |------------------------+------+---------------------+------|
          | Clock signal 0 out     |  10  | Channel 1C bit 3    |  30  |
          |------------------------+------+---------------------+------|
          | Clock signal 2 out     |  11  | Channel 1B bit 5    |  31  |
          |------------------------+------+---------------------+------|
          | Clock signal 2 in      |  12  | Channel 1B bit 0    |  32  |
          |------------------------+------+---------------------+------|
          | Clock signal 1 in      |  13  | Channel 1B bit 4    |  33  |
          |------------------------+------+---------------------+------|
          | Gate signal 2          |  14  | Channel 1B bit 1    |  34  |
          |------------------------+------+---------------------+------|
          | Clock signal 1 out     |  15  | Channel 1B bit 3    |  35  |
          |------------------------+------+---------------------+------|
          | Gate signal 1          |  16  | Channel 1B bit 2    |  36  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 5       |  17  | +5V power           |  37  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 4       |  18  | -5V power           |  38  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 7       |  19  | +12V power          |  39  |
          |------------------------+------+---------------------+------|
          | Channel 1A bit 6       |  20  | -12V power          |  40  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         CN2 PINOUT                         |
          |------------------------------------------------------------|
          |       Function        | Pin  |       Function       | Pin  |
          |-----------------------+------+----------------------+------|
          | Ground                |  1   | Channel 2C bit 7     |  21  |
          |-----------------------+------+----------------------+------|
          | Ground                |  2   | Channel 2C bit 6     |  22  |
          |-----------------------+------+----------------------+------|
          | Ground                |  3   | Channel 2C bit 5     |  23  |
          |-----------------------+------+----------------------+------|
          | Ground                |  4   | Channel 2C bit 4     |  24  |
          |-----------------------+------+----------------------+------|
          | Ground                |  5   | Channel 2C bit 0     |  25  |
          |-----------------------+------+----------------------+------|
          | Ground                |  6   | Channel 2C bit 1     |  26  |
          |-----------------------+------+----------------------+------|
          | Ground                |  7   | Channel 2C bit 2     |  27  |
          |-----------------------+------+----------------------+------|
          | Ground                |  8   | Channel 2B bit 7     |  28  |
          |-----------------------+------+----------------------+------|
          | Ground                |  9   | Channel 2C bit 3     |  29  |
          |-----------------------+------+----------------------+------|
          | Ground                |  10  | Channel 2B bit 6     |  30  |
          |-----------------------+------+----------------------+------|
          | Ground                |  11  | Channel 2B bit 0     |  31  |
          |-----------------------+------+----------------------+------|
          | Ground                |  12  | Channel 2B bit 5     |  32  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 0      |  13  | Channel 2B bit 1     |  33  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 1      |  14  | Channel 2B bit 4     |  34  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 2      |  15  | Channel 2B bit 2     |  35  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 3      |  16  | Channel 2B bit 3     |  36  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 4      |  17  | +5V power            |  37  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 5      |  18  | -5V power            |  38  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 6      |  19  | +12V power           |  39  |
          |-----------------------+------+----------------------+------|
          | Channel 2A bit 7      |  20  | -12V power           |  40  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |                 Setting                 | Label | Position |
          |-----------------------------------------+-------+----------|
          | » | Counter 0 uses internal clock       | JP1/A |  Closed  |
          |   | source                              |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Counter 0 uses external clock       | JP1/A |   Open   |
          |   | source                              |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Counter 1 uses internal clock       | JP1/B |  Closed  |
          |   | source                              |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Counter 1 uses external clock       | JP1/B |   Open   |
          |   | source                              |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Counter 2 uses internal clock       | JP1/C |  Closed  |
          |   | source                              |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Counter 2 uses external clock       | JP1/C |   Open   |
          |   | source                              |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Base I/O address set to 1B0h        |  JP2  |  Closed  |
          |---+-------------------------------------+-------+----------|
          |   | Base I/O address set to 1F0h        |  JP2  |   Open   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          |  LED   | Color  | Status  |           Condition            |
          |--------+--------+---------+--------------------------------|
          |  1PA0  |  Red   |   On    |   Channel 1A bit 0 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA0  |  Red   |   Off   | Channel 1A bit 0 is not active |
          |--------+--------+---------+--------------------------------|
          |  1PA1  |  Red   |   On    |   Channel 1A bit 1 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA1  |  Red   |   Off   | Channel 1A bit 1 is not active |
          |--------+--------+---------+--------------------------------|
          |  1PA2  |  Red   |   On    |   Channel 1A bit 2 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA2  |  Red   |   Off   | Channel 1A bit 2 is not active |
          |--------+--------+---------+--------------------------------|
          |  1PA3  |  Red   |   On    |   Channel 1A bit 3 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA3  |  Red   |   Off   | Channel 1A bit 3 is not active |
          |--------+--------+---------+--------------------------------|
          |  1PA4  |  Red   |   On    |   Channel 1A bit 4 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA4  |  Red   |   Off   | Channel 1A bit 4 is not active |
          |--------+--------+---------+--------------------------------|
          |  1PA5  |  Red   |   On    |   Channel 1A bit 5 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA5  |  Red   |   Off   | Channel 1A bit 5 is not active |
          |--------+--------+---------+--------------------------------|
          |  1PA6  |  Red   |   On    |   Channel 1A bit 6 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA6  |  Red   |   Off   | Channel 1A bit 6 is not active |
          |--------+--------+---------+--------------------------------|
          |  1PA7  |  Red   |   On    |   Channel 1A bit 7 is active   |
          |--------+--------+---------+--------------------------------|
          |  1PA7  |  Red   |   Off   | Channel 1A bit 7 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA0  |  Red   |   On    |   Channel 2A bit 0 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA0  |  Red   |   Off   | Channel 2A bit 0 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA1  |  Red   |   On    |   Channel 2A bit 1 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA1  |  Red   |   Off   | Channel 2A bit 1 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA2  |  Red   |   On    |   Channel 2A bit 2 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA2  |  Red   |   Off   | Channel 2A bit 2 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA3  |  Red   |   On    |   Channel 2A bit 3 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA3  |  Red   |   Off   | Channel 2A bit 3 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA4  |  Red   |   On    |   Channel 2A bit 4 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA4  |  Red   |   Off   | Channel 2A bit 4 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA5  |  Red   |   On    |   Channel 2A bit 5 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA5  |  Red   |   Off   | Channel 2A bit 5 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA6  |  Red   |   On    |   Channel 2A bit 6 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA6  |  Red   |   Off   | Channel 2A bit 6 is not active |
          |--------+--------+---------+--------------------------------|
          |  2PA7  |  Red   |   On    |   Channel 2A bit 7 is active   |
          |--------+--------+---------+--------------------------------|
          |  2PA7  |  Red   |   Off   | Channel 2A bit 7 is not active |
          +------------------------------------------------------------+