(TXT) View Source
       
       # CHAINTECH COMPUTER COMPANY, LTD.
       
          420SXB/425SXB/433SCB/450SCB
       
          Processor         80486SX/80487SX/80486DX/ODP486SX/80486DX2    
          Processor Speed   16/20/25/33/50(internal)/50/66(internal)MHz  
          Chip Set          SIS                                          
          Max. Onboard DRAM 32MB                                         
          Cache             64/128/256KB                                 
          BIOS              AMI                                          
          Dimensions        330mm x 218mm                                
          I/O Options       None                                         
          NPU Options       4167                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose          | Location | Purpose           | Location |
          |------------------+----------+-------------------+----------|
          | External battery |    J1    | Speaker           |    J4    |
          |------------------+----------+-------------------+----------|
          | Turbo LED        |    J2    | Power LED &       |    J5    |
          |                  |          | keylock           |          |
          |------------------+----------+-------------------+----------|
          | Turbo switch     |    J3    | Reset switch      |    J6    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper  | Position  |
          |--------------------------------------+---------+-----------|
          | » | Turbo enabled                    |   J3    |  Closed   |
          |---+----------------------------------+---------+-----------|
          |   | Turbo disabled                   |   J3    |   Open    |
          |---+----------------------------------+---------+-----------|
          | » | Monitor type select monochrome   |   J7    |   Open    |
          |---+----------------------------------+---------+-----------|
          |   | Monitor type select color        |   J7    |  Closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     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        |
          |------------------+--------------------+--------------------|
          |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |    Size    |    Bank 0     |    Bank 1     |      TAG      |
          |------------+---------------+---------------+---------------|
          |    64KB    |  (4) 8K x 8   |  (4) 8K x 8   |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   128KB    |  (4) 32K x 8  |     NONE      |  (1) 8K x 8   |
          |------------+---------------+---------------+---------------|
          |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
          +------------------------------------------------------------+
       
        +-----------------------------------------------------------------+
        |                   CACHE JUMPER CONFIGURATION                    |
        |-----------------------------------------------------------------|
        |Size |  RN12   |  RN15   |  RN16   |  RN17   |  RN18   |  RN19   |
        |-----+---------+---------+---------+---------+---------+---------|
        |64KB |Installed|Installed|   Not   |   Not   |   Not   |   Not   |
        |     |         |         |installed|installed|installed|installed|
        |-----+---------+---------+---------+---------+---------+---------|
        |128KB|   Not   |   Not   |   Not   |Installed|Installed|   Not   |
        |     |installed|installed|installed|         |         |installed|
        |-----+---------+---------+---------+---------+---------+---------|
        |256KB|   Not   |   Not   |Installed|   Not   |   Not   |Installed|
        |     |installed|installed|         |installed|installed|         |
        +-----------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |            Type            |              JP7              |
          |----------------------------+-------------------------------|
          |          80486SX           |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |          ODP486SX          |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |          80487SX           |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |          80486DX           |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |          80486DX2          |       pins 1 & 2 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |           Speed            |              JP1              |
          |----------------------------+-------------------------------|
          |           16MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |           20MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |          > 25MHz           |       pins 1 & 2 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                MISCELLANEOUS TECHNICAL NOTE                |
          |------------------------------------------------------------|
          | Note:If a Weitek coprocessor is desired, the optional      |
          | daughter board must be installed in CPU socket.            |
          +------------------------------------------------------------+