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       # BRAIN BOXES
       
          AT ONE PORT RS232
       
          Card Type           Serial card                                
          Chip Set            Unidentified                               
          Data Bus            8-bit ISA                                  
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |           Function            |           Label            |
          |-------------------------------+----------------------------|
          | 9-pin serial port             |            CN1             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               SERIAL PORT ADDRESS SELECTION                |
          |------------------------------------------------------------|
          |   COM port   |   Address   |   IRQ   |         JP1         |
          |--------------+-------------+---------+---------------------|
          |   |   COM1   |    3F8h     |  IRQ4   |        Open         |
          |---+----------+-------------+---------+---------------------|
          | » |   COM2   |    2F8h     |  IRQ3   |  Pins 3 & 4 closed  |
          |---+----------+-------------+---------+---------------------|
          |   |   COM3   |    3E8h     |  IRQ3   |  Pins 5 & 6 closed  |
          |---+----------+-------------+---------+---------------------|
          |   |   COM4   |    2E8h     |  IRQ3   |  Pins 7 & 8 closed  |
          |---+----------+-------------+---------+---------------------|
          |   |   COM5   |    1A0h     |  IRQ3   | Pins 9 & 10 closed  |
          |---+----------+-------------+---------+---------------------|
          |   |   COM6   |    1A8h     |  IRQ3   | Pins 11 & 12 closed |
          |---+----------+-------------+---------+---------------------|
          |   |   COM7   |    1B0h     |  IRQ3   | Pins 13 & 14 closed |
          |---+----------+-------------+---------+---------------------|
          |   |   COM8   |    1B8h     |  IRQ3   | Pins 15 & 16 closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 SERIAL PORT IRQ SELECTION                  |
          |------------------------------------------------------------|
          |            IRQ             |              JP2              |
          |----------------------------+-------------------------------|
          |   |          IRQ2          |      Pins 11 & 12 closed      |
          |---+------------------------+-------------------------------|
          | » |          IRQ3          |      Pins 9 & 10 closed       |
          |---+------------------------+-------------------------------|
          |   |          IRQ4          |       Pins 7 & 8 closed       |
          |---+------------------------+-------------------------------|
          |   |          IRQ5          |       Pins 5 & 6 closed       |
          |---+------------------------+-------------------------------|
          |   |          IRQ6          |       Pins 3 & 4 closed       |
          |---+------------------------+-------------------------------|
          |   |          IRQ7          |       Pins 1 & 2 closed       |
          |---+------------------------+-------------------------------|
          |   |         IRQ10          |      Pins 13 & 14 closed      |
          |---+------------------------+-------------------------------|
          |   |         IRQ11          |      Pins 15 & 16 closed      |
          |---+------------------------+-------------------------------|
          |   |         IRQ12          |      Pins 17 & 18 closed      |
          |---+------------------------+-------------------------------|
          |   |         IRQ14          |      Pins 19 & 20 closed      |
          +------------------------------------------------------------+