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       # LEADING EDGE PRODUCTS, INC.
       
          MODEL D4 PLUS
       
          Processor    80486SX/80487SX/80486DX/80486DX2                  
          Processor    25/33/50(internal)/66(internal)MHz                
          Speed        
          Chip Set     Unidentified                                      
          Max. Onboard 32MB                                              
          DRAM         
          Cache        64/128/256KB (on CPU card)                        
          BIOS         AMI                                               
          Dimensions   330mm x 218mm                                     
          I/O Options  External CPU card, floppy drive interface, IDE    
                       interface, parallel port, PS/2 mouse port, serial 
                       ports (2)                                         
          NPU Options  None                                              
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose         | Location | Purpose            | Location |
          |-----------------+----------+--------------------+----------|
          | PS/2 mouse port |   CN1    | Floppy drive       |   CN6    |
          |                 |          | interface          |          |
          |-----------------+----------+--------------------+----------|
          | Serial port 1   |   CN3    | IDE interface      |   CN7    |
          |-----------------+----------+--------------------+----------|
          | Serial port 2   |   CN4    | CPU card slot      |   SL1    |
          |-----------------+----------+--------------------+----------|
          | Parallel port   |   CN5    |                    |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | Monitor type select color        |  JP1   |   Closed   |
          |---+----------------------------------+--------+------------|
          |   | Monitor type select monochrome   |  JP1   |    Open    |
          |---+----------------------------------+--------+------------|
          | » | Parallel port enabled (printer)  |  JP2   |    Open    |
          |---+----------------------------------+--------+------------|
          |   | Parallel port disabled           |  JP2   |   Closed   |
          |---+----------------------------------+--------+------------|
          | » | CMOS memory normal operation     |  JP3   | pins 1 & 2 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | CMOS memory clear                |  JP3   | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Standard local bus card          |  JP5   | pins 1 & 2 |
          |   | installed                        |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | Standard local bus card not      |  JP5   | pins 2 & 3 |
          |   | installed                        |        |   closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |       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) 1M x 9     |     (4) 1M x 9     |
          |------------------+--------------------+--------------------|
          |       16MB       |     (4) 4M x 9     |        NONE        |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          +------------------------------------------------------------+
       
 (IMG) IMG 2
          
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size  |   Bank 0    |   Bank 1   | TAG (U12)  | TAG (U13)  |
          |-------+-------------+------------+------------+------------|
          | 64KB  | (4) 8K x 8  | (4) 8K x 8 |    NONE    | (1) 8K x 8 |
          |-------+-------------+------------+------------+------------|
          | 128KB | (4) 32K x 8 |    NONE    |    NONE    | (1) 8K x 8 |
          |-------+-------------+------------+------------+------------|
          | 256KB | (4) 32K x 8 | (4) 32K x  | (1) 8K x 8 | (1) 8K x 8 |
          |       |             |     8      |            |            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             CACHE JUMPER/SWITCH CONFIGURATION              |
          |------------------------------------------------------------|
          |  Size  |        JP1        | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
          |--------+-------------------+-------+-------+-------+-------|
          |  64KB  | pins 2 & 3 closed |  Off  |  Off  |  Off  |  Off  |
          |--------+-------------------+-------+-------+-------+-------|
          | 128KB  | pins 1 & 2 closed |  On   |  Off  |  Off  |  On   |
          |--------+-------------------+-------+-------+-------+-------|
          | 256KB  | pins 2 & 3 closed |  On   |  On   |  Off  |  On   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |           Type           |               JP3               |
          |--------------------------+---------------------------------|
          |         80486SX          |        pins 5 & 6 closed        |
          |--------------------------+---------------------------------|
          |         80487SX          | pins 2 & 3, 4 & 5, 6 & 7 closed |
          |--------------------------+---------------------------------|
          |         80486DX          | pins 1 & 2, 4 & 5, 6 & 7 closed |
          |--------------------------+---------------------------------|
          |         80486DX2         | pins 1 & 2, 4 & 5, 6 & 7 closed |
          +------------------------------------------------------------+