(TXT) View Source
       
       # UNIDENTIFIED
       
          OPTI486DX-33/50WB, 486SX-20/25WB
       
          Processor         80486SX/80486DX                              
          Processor Speed   20/25/33/50(internal)MHz                     
          Chip Set          OPTI                                         
          Max. Onboard DRAM 40MB (8MB on external memory card)           
          Cache             64/256KB                                     
          BIOS              AMI                                          
          Dimensions        330mm x 218mm                                
          I/O Options       32-bit external memory card                  
          NPU Options       4167                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose           | Location | Purpose          | Location |
          |-------------------+----------+------------------+----------|
          | External battery  |   J10    | 32-bit external  |   SL1    |
          |                   |          | memory card      |          |
          |-------------------+----------+------------------+----------|
          | Turbo LED         |   J12    | Reset switch     |   SW1    |
          |-------------------+----------+------------------+----------|
          | Power LED &       |   J23    | Turbo switch     |   SW2    |
          | keylock           |          |                  |          |
          |-------------------+----------+------------------+----------|
          | Speaker           |   J24    |                  |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Jumper |   Position   |
          |------------------------------------+--------+--------------|
          | » | Monitor type select monochrome |  JP1   |     Open     |
          |---+--------------------------------+--------+--------------|
          |   | Monitor type select color      |  JP1   |    Closed    |
          |---+--------------------------------+--------+--------------|
          | » | CMOS memory normal operation   |  JP2   |  pins 2 & 3  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | CMOS memory clear              |  JP2   |  pins 1 & 2  |
          |   |                                |        |    closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
          |------+-------------+-------------+------------+------------|
          | 1MB  | (4) 256K x  |    NONE     |    NONE    |    NONE    |
          |      |      9      |             |            |            |
          |------+-------------+-------------+------------+------------|
          | 2MB  | (4) 256K x  | (4) 256K x  |    NONE    |    NONE    |
          |      |      9      |      9      |            |            |
          |------+-------------+-------------+------------+------------|
          | 3MB  | (4) 256K x  | (4) 256K x  | (4) 256K x |    NONE    |
          |      |      9      |      9      |     9      |            |
          |------+-------------+-------------+------------+------------|
          | 4MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 256K x |
          |      |      9      |      9      |     9      |     9      |
          |------+-------------+-------------+------------+------------|
          | 4MB  | (4) 1M x 9  |    NONE     |    NONE    |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 5MB  | (4) 256K x  | (4) 1M x 9  |    NONE    |    NONE    |
          |      |      9      |             |            |            |
          |------+-------------+-------------+------------+------------|
          | 6MB  | (4) 256K x  | (4) 256K x  | (4) 1M x 9 |    NONE    |
          |      |      9      |      9      |            |            |
          |------+-------------+-------------+------------+------------|
          | 7MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 1M x 9 |
          |      |      9      |      9      |     9      |            |
          |------+-------------+-------------+------------+------------|
          | 8MB  | (4) 1M x 9  | (4) 1M x 9  |    NONE    |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 12MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 16MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
          |------+-------------+-------------+------------+------------|
          | 16MB | (4) 4M x 9  |    NONE     |    NONE    |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 32MB | (4) 4M x 9  | (4) 4M x 9  |    NONE    |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 36MB | (4) 4M x 9  | (4) 4M x 9  | (4) 1M x 9 |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 40MB | (4) 4M x 9  | (4) 4M x 9  | (4) 1M x 9 | (4) 1M x 9 |
          |------------------------------------------------------------|
          | Note: Banks 2 & 3 are located on the external memory card. |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size    |    Bank 0     |    Bank 1     |      TAG      |
          |------------+---------------+---------------+---------------|
          |    64KB    |  (4) 8K x 8   |  (4) 8K x 8   |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |   Size    |    JP8     |    JP9    |   JP10    |   JP11    |
          |-----------+------------+-----------+-----------+-----------|
          |   64KB    |    Open    |   Open    |   Open    |   Open    |
          |-----------+------------+-----------+-----------+-----------|
          |   256KB   |   Closed   |  Closed   |  Closed   |  Closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |   Type   |        JP5        |        JP6        |   JP7   |
          |----------+-------------------+-------------------+---------|
          | 80486SX  | pins 1 & 2 closed | pins 2 & 3 closed |  Open   |
          |----------+-------------------+-------------------+---------|
          | 80486DX  | pins 2 & 3 closed | pins 1 & 2 closed | Closed  |
          +------------------------------------------------------------+