(TXT) View Source
       
       # PC BRAND
       
          486/25C CACHE MAINBOARD
       
          (MYSTERY MACHINE)
       
          Processor         80486SX                                      
          Processor Speed   25MHz                                        
          Chip Set          OPTI                                         
          Max. Onboard DRAM 16MB                                         
          Cache             128KB (on external cache card)               
          BIOS              AMI                                          
          Dimensions        330mm x 218mm                                
          I/O Options       External cache card                          
          NPU Options       4167                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose             | Location | Purpose        | Location |
          |---------------------+----------+----------------+----------|
          | External battery    |    J1    | Turbo switch   |    J9    |
          |---------------------+----------+----------------+----------|
          | Power LED & keylock |    J6    | Turbo LED      |   J10    |
          |---------------------+----------+----------------+----------|
          | Speaker             |    J7    | External cache |   SL1    |
          |                     |          | slot           |          |
          |---------------------+----------+----------------+----------|
          | Reset switch        |    J8    |                |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | Battery type select internal     |   J1   | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | Battery type select external     |   J1   |   Closed   |
          |---+----------------------------------+--------+------------|
          | » | Monitor type select monochrome   |   J2   |    Open    |
          |---+----------------------------------+--------+------------|
          |   | Monitor type select color        |   J2   |   Closed   |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |   J3   |    N/A     |
          |   | alter                            |        |            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     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      |             |            |            |
          |------+-------------+-------------+------------+------------|
          | 5MB  | (4) 1M x 9  | (4) 256K x  |    NONE    |    NONE    |
          |      |             |      9      |            |            |
          |------+-------------+-------------+------------+------------|
          | 6MB  | (4) 256K x  | (4) 256K x  | (4) 1M x 9 |    NONE    |
          |      |      9      |      9      |            |            |
          |------+-------------+-------------+------------+------------|
          | 6MB  | (4) 256K x  | (4) 1M x 9  | (4) 256K x |    NONE    |
          |      |      9      |             |     9      |            |
          |------+-------------+-------------+------------+------------|
          | 6MB  | (4) 1M x 9  | (4) 256K x  | (4) 256K x |    NONE    |
          |      |             |      9      |     9      |            |
          |------+-------------+-------------+------------+------------|
          | 7MB  | (4) 256K x  | (4) 256K x  | (4) 1M x 9 | (4) 256K x |
          |      |      9      |      9      |            |     9      |
          |------+-------------+-------------+------------+------------|
          | 7MB  | (4) 256K x  | (4) 1M x 9  | (4) 256K x | (4) 256K x |
          |      |      9      |             |     9      |     9      |
          |------+-------------+-------------+------------+------------|
          | 7MB  | (4) 1M x 9  | (4) 256K x  | (4) 256K x | (4) 256K x |
          |      |             |      9      |     9      |     9      |
          |------+-------------+-------------+------------+------------|
          | 8MB  | (4) 1M x 9  | (4) 1M x 9  |    NONE    |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 9MB  | (4) 256K x  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
          |      |      9      |             |            |            |
          |------+-------------+-------------+------------+------------|
          | 9MB  | (4) 1M x 9  | (4) 1M x 9  | (4) 256K x |    NONE    |
          |      |             |             |     9      |            |
          |------+-------------+-------------+------------+------------|
          | 9MB  | (4) 1M x 9  | (4) 256K x  | (4) 1M x 9 |    NONE    |
          |      |             |      9      |            |            |
          |------+-------------+-------------+------------+------------|
          | 10MB | (4) 256K x  | (4) 256K x  | (4) 1M x 9 | (4) 1M x 9 |
          |      |      9      |      9      |            |            |
          |------+-------------+-------------+------------+------------|
          | 10MB | (4) 256K x  | (4) 1M x 9  | (4) 1M x 9 | (4) 256K x |
          |      |      9      |             |            |     9      |
          |------+-------------+-------------+------------+------------|
          | 10MB | (4) 1M x 9  | (4) 1M x 9  | (4) 256K x | (4) 256K x |
          |      |             |             |     9      |     9      |
          |------+-------------+-------------+------------+------------|
          | 10MB | (4) 1M x 9  | (4) 256K x  | (4) 1M x 9 | (4) 256K x |
          |      |             |      9      |            |     9      |
          |------+-------------+-------------+------------+------------|
          | 12MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
          |------+-------------+-------------+------------+------------|
          | 13MB | (4) 256K x  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
          |      |      9      |             |            |            |
          |------+-------------+-------------+------------+------------|
          | 13MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 | (4) 256K x |
          |      |             |             |            |     9      |
          |------+-------------+-------------+------------+------------|
          | 13MB | (4) 1M x 9  | (4) 256K x  | (4) 1M x 9 | (4) 1M x 9 |
          |      |             |      9      |            |            |
          |------+-------------+-------------+------------+------------|
          | 16MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |            Size            |              SL1              |
          |----------------------------+-------------------------------|
          |           128KB            |        Card installed         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |     Setting      |         J4         |         J5         |
          |------------------+--------------------+--------------------|
          |    Cache mode    | pins 1 & 2 closed  | pins 1 & 2 closed  |
          |------------------+--------------------+--------------------|
          |    Burst mode    | pins 2 & 3 closed  | pins 2 & 3 closed  |
          +------------------------------------------------------------+