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       # COMPUTREND SYSTEMS, INC.
       
          UMC-386 (MS-3131 Ver. 1.1)
       
          Processor          80386DX                                     
          Processor Speed    33/40MHz                                    
          Chip Set           UMC                                         
          Max. Onboard DRAM  32MB                                        
          SRAM Cache         32/64/128/256KB                             
          BIOS               AMI                                         
          Dimensions         220mm x 220mm                               
          I/O Options        Auxiliary keyboard connector                
          NPU Options        80387                                       
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose          | Location | Purpose           | Location |
          |------------------+----------+-------------------+----------|
          | External battery |    J1    | Turbo switch      | J2/15 -  |
          |                  |          |                   |    17    |
          |------------------+----------+-------------------+----------|
          | Power LED &      | J2/1 - 5 | Turbo LED         | J2/12 &  |
          | keylock          |          |                   |    13    |
          |------------------+----------+-------------------+----------|
          | Speaker          |  J2/7 -  | Auxiliary         |   KB2    |
          |                  |    10    | keyboard          |          |
          |------------------+----------+-------------------+----------|
          | Reset switch     | J2/19 &  |                   |          |
          |                  |    20    |                   |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Jumper |   Position   |
          |------------------------------------+--------+--------------|
          | » | Monitor type select monochrome |  JP1   |     open     |
          |---+--------------------------------+--------+--------------|
          |   | Monitor type select color      |  JP1   |    closed    |
          |---+--------------------------------+--------+--------------|
          | » | NPU disabled                   |  JP3   |     open     |
          |   |                                |        |              |
          |   |                                |  JP9   |     open     |
          |---+--------------------------------+--------+--------------|
          |   | NPU endabled                   |  JP3   |    closed    |
          |   |                                |        |              |
          |   |                                |  JP9   |    closed    |
          |---+--------------------------------+--------+--------------|
          | » | Battery select internal        |   J1   |  pins 2 & 3  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | battery select external        |   J1   |  connected   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |       1MB        |    (4) 256K x 9    |        NONE        |
          |------------------+--------------------+--------------------|
          |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
          |------------------+--------------------+--------------------|
          |       4MB        |     (4) 1M x 9     |        NONE        |
          |------------------+--------------------+--------------------|
          |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
          |------------------+--------------------+--------------------|
          |       16MB       |     (4) 4M x 9     |        NONE        |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |Size | JP4  | JP5  | JP6  | JP7  | JP8  | JP11 |JP12 | JP13 |
          |-----+------+------+------+------+------+------+-----+------|
          |32KB | open | open |pins 2|pins 1|pins 1|pins 2|pins | open |
          |     |      |      | & 3  | & 2  | & 2  | & 3  |1 & 2|      |
          |-----+------+------+------+------+------+------+-----+------|
          |64KB | open | open |pins 2|pins 1|pins 1|pins 1|pins |closed|
          |     |      |      | & 3  | & 2  | & 2  | & 2  |2 & 3|      |
          |-----+------+------+------+------+------+------+-----+------|
          |128KB|closed| open |pins 1|pins 2|pins 1|pins 1|pins |closed|
          |     |      |      | & 2  | & 3  | & 2  | & 2  |2 & 3|      |
          |-----+------+------+------+------+------+------+-----+------|
          |256KB|closed|closed|pins 2|pins 2|pins 2|pins 1|pins |closed|
          |     |      |      | & 3  | & 3  | & 3  | & 2  |2 & 3|      |
          |------------------------------------------------------------|
          |Note:Pins designated should be in the closed position.      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size    |  Cache SRAM   |   Location    |      TAG      |
          |------------+---------------+---------------+---------------|
          |    32KB    |  (4) 8K x 8   |    Bank 0     |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |    64KB    |  (8) 8K x 8   |  Banks 0 & 1  |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   128KB    |  (4) 32K x 8  |    Bank 0     |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (8) 32K x 8  |  Banks 0 & 1  |  (1) 32K x 8  |
          +------------------------------------------------------------+