CHAINTECH COMPUTER COMPANY, LTD.
================================

   425UXL/433UXL/425UCL/433UCL

   Processor         80486SX/80487SX/80486DX/ODP486SX/80486DX2    
   Processor Speed   25/33/40/50(internal)/66(internal)MHz        
   Chip Set          USAI                                         
   Max. Onboard DRAM 32MB                                         
   Cache             64/128/256KB                                 
   BIOS              AMI                                          
   Dimensions        254mm x 220mm                                
   I/O Options       32-bit VESA local bus slots (2)              
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/C-D/32307-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | Power LED &   |    J2    | External battery     |    J7    |
   | keylock       |          |                      |          |
   |---------------+----------+----------------------+----------|
   | Turbo switch  |    J4    | Speaker              |   J100   |
   |---------------+----------+----------------------+----------|
   | Turbo LED     |    J5    | 32-bit VESA local    |  SL1 &   |
   |               |          | bus slots            |   SL2    |
   |---------------+----------+----------------------+----------|
   | Reset switch  |    J6    |                      |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Jumper  | Position |
   |---------------------------------------+---------+----------|
   |>> | Turbo enabled                     |   J4    |  Closed  |
   |---+-----------------------------------+---------+----------|
   |   | Turbo disabled                    |   J4    |   Open   |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  JMP3   |   Open   |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  JMP4   |   Open   |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  JMP5   |   Open   |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  JMP7   |   Open   |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  JMP10  |   Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       1MB        |    (4) 256K x 9    |        NONE        |
   |------------------+--------------------+--------------------|
   |       1MB        |        NONE        |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       4MB        |        NONE        |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       16MB       |        NONE        |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M 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  |              JMP1              |       JMP8        |
   |-------+--------------------------------+-------------------|
   | 64KB  |    pins 1 & 2, 4 & 5, 7 & 8    | pins 1 & 2, 4 & 5 |
   |       |             closed             |      closed       |
   |-------+--------------------------------+-------------------|
   | 128KB |    pins 2 & 3, 4 & 5, 8 & 9    | pins 2 & 3, 4 & 5 |
   |       |             closed             |      closed       |
   |-------+--------------------------------+-------------------|
   | 256KB |    pins 2 & 3, 5 & 6, 8 & 9    | pins 2 & 3, 5 & 6 |
   |       |             closed             |      closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |            Type            |             JMP2              |
   |----------------------------+-------------------------------|
   |          80486SX           |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          ODP486SX          |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |          80487SX           |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |          80486DX           |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |          80486DX2          |       pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  VESA SPEED CONFIGURATION                  |
   |------------------------------------------------------------|
   |           Speed            |             JMP6              |
   |----------------------------+-------------------------------|
   |           33MHz            |   pins 1 & 4, 3 & 6 closed    |
   |----------------------------+-------------------------------|
   |           40MHz            |   pins 1 & 4, 2 & 5 closed    |
   |----------------------------+-------------------------------|
   |           50MHz            |       pins 1 & 4 closed       |
   +------------------------------------------------------------+