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       # DD & TT ENTERPRISE USA COMPANY
       
          DT-LB134 (36-BIT SIMM VERSION)
       
          Processor   80386DX/CX486DLC/80486SX/80486DX/80486DX2/ODP586SX 
          Processor   20/25/33/40/50(internal)/50/66(internal)MHz        
          Speed       
          Chip Set    Symphony                                           
          Max.        64MB                                               
          Onboard     
          DRAM        
          SRAM Cache  64/256KB                                           
          BIOS        AMI                                                
          Dimensions  330mm x 218mm                                      
          I/O Options PS/2 mouse, 32-bit VESA local bus slot             
          NPU Options CX87DLC/80387DX                                    
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose       | Location  | Purpose            | Location  |
          |---------------+-----------+--------------------+-----------|
          | Turbo LED     | J1/pins 1 | Speaker            | J2B/pins  |
          |               |    & 2    |                    |   1 & 4   |
          |---------------+-----------+--------------------+-----------|
          | Turbo switch  | J1/pins 3 | Mouse port header  |   J11A    |
          |               |    & 4    |                    |           |
          |---------------+-----------+--------------------+-----------|
          | Reset switch  | J1/pins 5 | PS/2 mouse port    |   J11B    |
          |               |    & 6    |                    |           |
          |---------------+-----------+--------------------+-----------|
          | Power LED &   |    J2A    | 32-bit VESA local  |    S1     |
          | keylock       |           | bus                |           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               |  Jumper   | Position |
          |-------------------------------------+-----------+----------|
          |   | Factory configured-do not alter | E2/pins 1 | unknown  |
          |   |                                 |    & 2    |          |
          |---+---------------------------------+-----------+----------|
          |   | Factory configured-do not alter | E2/pins 3 | unknown  |
          |   |                                 |    & 4    |          |
          |---+---------------------------------+-----------+----------|
          | » | Monitor type select color       | E2/pins 5 |  closed  |
          |   |                                 |    & 6    |          |
          |---+---------------------------------+-----------+----------|
          |   | Monitor type select monochrome  | E2/pins 5 |   open   |
          |   |                                 |    & 6    |          |
          |---+---------------------------------+-----------+----------|
          |   | ATCLK iOSC/2                    |  E7/1-3,  |  closed  |
          |   |                                 |    4-6    |          |
          |---+---------------------------------+-----------+----------|
          |   | ATCLK iOSC/1                    |  E7/3-5,  |  closed  |
          |   |                                 |    2-4    |          |
          |---+---------------------------------+-----------+----------|
          | » | Mouse port enabled              |    E12    |  closed  |
          |---+---------------------------------+-----------+----------|
          |   | Mouse port disabled             |    E12    |   open   |
          |---+---------------------------------+-----------+----------|
          | » | CMOS memory normal operation    |    E13    |   open   |
          |---+---------------------------------+-----------+----------|
          |   | CMOS memory clear               |    E13    |  closed  |
          |---+---------------------------------+-----------+----------|
          | » | Onboard speaker enabled         | J2B/pins  |  closed  |
          |   |                                 |   1 & 2   |          |
          |---+---------------------------------+-----------+----------|
          |   | Onboard speaker disabled        | J2B/pins  |   open   |
          |   |                                 |   1 & 2   |          |
          |---+---------------------------------+-----------+----------|
          |   | Burst mode 3-2-2-2              |    JP1    |  closed  |
          |---+---------------------------------+-----------+----------|
          |   | Burst mode 2-1-1-1              |    JP1    |   open   |
          |---+---------------------------------+-----------+----------|
          |   | Cache wait state select 0 wait  |    JP2    |  closed  |
          |   | states                          |           |          |
          |---+---------------------------------+-----------+----------|
          |   | Cache wait state select 1 wait  |    JP2    |   open   |
          |   | state                           |           |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 SRAM JUMPER CONFIGURATION                  |
          |------------------------------------------------------------|
          |      Jumper      |        64K         |        256K        |
          |------------------+--------------------+--------------------|
          |       E1A        | pins 2 & 3 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |       E1B        | pins 2 & 3 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |       E1C        |        open        |       closed       |
          |------------------+--------------------+--------------------|
          |       E1D        |        open        |       closed       |
          |------------------+--------------------+--------------------|
          |       E1E        |        open        |       closed       |
          |------------------+--------------------+--------------------|
          |       E1F        | pins 1 & 2 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |       E1G        | pins 1 & 2 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |       E1H        | pins 1 & 2 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |       E1I        | pins 1 & 2 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |       E1J        |       closed       |       closed       |
          |------------------+--------------------+--------------------|
          |       E1K        |       closed       |       closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     SRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Cache        |        TAG         |
          |------------------+--------------------+--------------------|
          |       64KB       |     (8) 8K x 8     |     (1) 8K x 4     |
          |------------------+--------------------+--------------------|
          |      256KB       |    (8) 32K x 8     |    (1) 32K x 4     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |  Size  |   Bank 0   |   Bank 1   |   Bank 2   |   Bank3    |
          |--------+------------+------------+------------+------------|
          |  1MB   | 256K x 36  |    NONE    |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  2MB   | 256K x 36  | 256K x 36  |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  3MB   | 256K x 36  | 256K x 36  | 256K x 36  |    NONE    |
          |--------+------------+------------+------------+------------|
          |  4MB   | 256K x 36  | 256K x 36  | 256K x 36  | 256K x 36  |
          |--------+------------+------------+------------+------------|
          |  4MB   |  1MB x 36  |    NONE    |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  5MB   |  1MB x 36  | 256K x 36  |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  7MB   |  1MB x 36  | 256K x 36  | 256K x 36  | 256K x 36  |
          |--------+------------+------------+------------+------------|
          |  8MB   |  1MB x 36  |  1MB x 36  |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  9MB   |  1MB x 36  |  1MB x 36  | 256K x 36  |    NONE    |
          |--------+------------+------------+------------+------------|
          |  10MB  |  1MB x 36  |  1MB x 36  | 256K x 36  | 256K x 36  |
          |--------+------------+------------+------------+------------|
          |  12MB  |  1MB x 36  |  1MB x 36  |  1MB x 36  |    NONE    |
          |--------+------------+------------+------------+------------|
          |  16MB  |  1MB x 36  |  1MB x 36  |  1MB x 36  |  1MB x 36  |
          |--------+------------+------------+------------+------------|
          |  16MB  |  4MB x 36  |    NONE    |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  17MB  |  4MB x 36  | 256K x 36  |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  19MB  |  4MB x 36  | 256K x 36  | 256K x 36  | 256K x 36  |
          |--------+------------+------------+------------+------------|
          |  20MB  |  4MB x 36  |  1MB x 36  |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  28MB  |  4MB x 36  |  1MB x 36  |  1MB x 36  |  1MB x 36  |
          |--------+------------+------------+------------+------------|
          |  32MB  |  4MB x 36  |  4MB x 36  |    NONE    |    NONE    |
          |--------+------------+------------+------------+------------|
          |  34MB  |  4MB x 36  |  4MB x 36  | 256K x 36  | 256K x 36  |
          |--------+------------+------------+------------+------------|
          |  40MB  |  4MB x 36  |  4MB x 36  |  1MB x 36  |  1MB x 36  |
          |--------+------------+------------+------------+------------|
          |  64MB  |  4MB x 36  |  4MB x 36  |  4MB x 36  |  4MB x 36  |
          +------------------------------------------------------------+
       
       +------------------------------------------------------------------------------+
       |                            CPU TYPE CONFIGURATION                            |
       |------------------------------------------------------------------------------|
       |  Type  |    E3     |       E4       |  E5   |       E6       |  E7   |  E8   |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80386DX |   open    |    3&4,9&10    |1&3,4&6|3&4,9&11,10&12, |1&3,4&6|  3&4  |
       |   33   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80386DX |   open    |  3&4,7&8,9&10  |1&3,4&6| 3&4,9&11,10&12 |1&3,4&6|  5&6  |
       |   40   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |CX486DLC|   open    |    3&4,9&10    |1&3,4&6| 3&4,9&11,10&12 |1&3,4&6|  3&4  |
       |   33   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |CX486DLC|   open    |  3&4,7&8,9&10  |1&3,4&6| 3&4,9&11,10&12 |1&3,4&6|  5&6  |
       |   40   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80486SX |    2&3    |    1&2,9&10    |3&5,4&6|1&2,5&6,7&9,8&10|1&3,4&6|  1&2  |
       |   20   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80486SX |    2&3    |    1&2,9&10    |3&5,4&6|1&2,5&6,7&9,8&10|1&3,4&6|3&4,5&6|
       |   25   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80486SX |    2&3    |    1&2,9&10    |3&5,4&6|1&2,5&6,7&9,8&10|1&3,4&6|  3&4  |
       |   33   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80486DX |1&2,3&4,5&6|    1&2,9&10    |3&5,4&6|1&2,5&6,7&9,8&10|1&3,4&6|  3&4  |
       |   33   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80486DX2|1&2,3&4,5&6|    1&2,9&10    |3&5,4&6|1&2,5&6,7&9,8&10|1&3,4&6|3&4,5&6|
       |   50   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80486DX |1&2,3&4,5&6|1&2,5&6,7&8,9&10|1&3,2&4|1&2,5&6,7&9,8&10|3&5,2&4|3&4,5&6|
       |   50   |           |                |       |                |       |       |
       |--------+-----------+----------------+-------+----------------+-------+-------|
       |80486DX2|1&2,3&4,5&6|    1&2,9&10    |3&5,4&6|1&2,5&6,7&9,8&10|1&3,4&6|  3&4  |
       |   66   |           |                |       |                |       |       |
       |------------------------------------------------------------------------------|
       |Notes: Pins indicated should be in the closed position.                       |
       |                                                                              |
       |Early versions of the board (model DT-LB133) do not support the 80486 series  |
       |processor.                                                                    |
       +------------------------------------------------------------------------------+