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       # SDL COMMUNICATIONS, INC.
       
          RISCOM/N2
       
          Card Type              Serial                                  
          Chip Set               Hitachi HD64570                         
          Maximum Onboard Memory 256KB DRAM                              
          Data Bus               16-bit ISA                              
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |       Function       | Label |      Function       | Label |
          |----------------------+-------+---------------------+-------|
          | RS-232, RS-422/449,  |  CN1  | RS-232, RS-422/449, |  CN2  |
          | RS-530, or V.35 port |       | RS-530, or V.35     |       |
          | 1                    |       | port 2              |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Factory configured - do not     | S1/7  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | S1/8  | Unidentified |
          |   | alter                           |       |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         INTERRUPT                          |
          |------------------------------------------------------------|
          |      J1 is used to set the interrupt. Exact settings are   |
          |      unidentified. Interrupts 3, 4, 5, 9, 10, 11, 12, and  |
          |      15 are available.                                     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      BASE I/O ADDRESS                      |
          |------------------------------------------------------------|
          |  Setting  | SW1/1  | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
          |-----------+--------+-------+-------+-------+-------+-------|
          |   | 100h  |   On   |  On   |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 110h  |  Off   |  On   |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 120h  |   On   |  Off  |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 130h  |  Off   |  Off  |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 140h  |   On   |  On   |  Off  |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          | » | 300h  |   On   |  On   |  On   |  On   |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3B0h  |  Off   |  Off  |  On   |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3C0h  |   On   |  On   |  Off  |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3D0h  |  Off   |  On   |  Off  |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3E0h  |   On   |  Off  |  Off  |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3F0h  |  Off   |  Off  |  Off  |  Off  |  Off  |  Off  |
          |------------------------------------------------------------|
          |      Note: A total of 48 base address settings are         |
          |      available. The switches are a binary representation   |
          |      of the decimal memory addresses. SW1/6 is the Most    |
          |      Significant Bit and switch SW1/1 is the Least         |
          |      Significant Bit. The switches have the following      |
          |      decimal values: SW1/6=512, SW1/5=256, SW1/4=128,      |
          |      SW1/3=64, SW1/2=32, SW1/1=16. Turn off the switches   |
          |      and add the values of the switches to obtain the      |
          |      correct memory address. (Off=1, On=0)                 |
          +------------------------------------------------------------+