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

   486SCSL/486SCSI

   Processor    CX486S/CX486S &                                   
                CX487S/80486SX/80487SX/AMD486DX/80486DX/          
                                                                  
                ODP486SX/ 80486DX2                                
   Processor    25/33/40/50(internal)/50/66(internal)MHz          
   Speed        
   Chip Set     SIS                                               
   Max. Onboard 32MB                                              
   DRAM         
   Cache        64/128/256KB                                      
   BIOS         AMI                                               
   Dimensions   265mm x 220mm                                     
   I/O Options  32-bit VESA local bus slots (2) (486SCSL only)    
   NPU Options  None                                              

<gopher://bitreich.org/I/th99/m/C-D/32301-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |    J1    | Power LED &       |    J5    |
   |                  |          | keylock           |          |
   |------------------+----------+-------------------+----------|
   | Turbo LED        |    J2    | Reset switch      |    J6    |
   |------------------+----------+-------------------+----------|
   | Turbo switch     |    J3    | 32-bit VESA local |  SL1 &   |
   |                  |          | bus slots         |   SL2    |
   |------------------+----------+-------------------+----------|
   | Speaker          |    J4    |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function             | Jumper |    Position    |
   |----------------------------------+--------+----------------|
   |>> | Turbo switch select low      |   J3   |      Open      |
   |---+------------------------------+--------+----------------|
   |   | Turbo switch select high     |   J3   |     Closed     |
   |---+------------------------------+--------+----------------|
   |>> | CMOS memory normal operation |  JP12  |   Pins 1 & 2   |
   |   |                              |        |     closed     |
   |---+------------------------------+--------+----------------|
   |   | CMOS memory clear            |  JP12  |   Pins 2 & 3   |
   |   |                              |        |     closed     |
   |---+------------------------------+--------+----------------|
   |>> | PQFP CPU disabled            |  JP16  |     Closed     |
   |---+------------------------------+--------+----------------|
   |   | PQFP CPU enabled             |  JP16  |      Open      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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) 16K x 8 or (1) 32K |
   |       |             |             |          x 8           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |  JP1  |  JP2  |  JP3  | JP4  | JP5  |  JP6  | JP7  |
   |-------+-------+-------+-------+------+------+-------+------|
   | 64KB  | 1 & 2 | 1 & 2 | 1 & 2 | 1 &  | 2 &  | Open  | 1 &  |
   |       |       |       |       |  2   |  3   |       |  2   |
   |-------+-------+-------+-------+------+------+-------+------|
   | 128KB | 2 & 3 | 1 & 2 | 2 & 3 | 1 &  | 1 &  | 1 & 2 | 2 &  |
   |       |       |       |       |  2   |  2   |       |  3   |
   |-------+-------+-------+-------+------+------+-------+------|
   | 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 &  | 2 &  | 2 & 3 | 2 &  |
   |       |       |       |       |  3   |  3   |       |  3   |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |      Type       |      JP13      |      JP14      |  JP15  |
   |-----------------+----------------+----------------+--------|
   |     CX486S      |      Open      |   Pins 2 & 3   |  Open  |
   |                 |                |     closed     |        |
   |-----------------+----------------+----------------+--------|
   | CX486S & CX487S |   Pins 1 & 2   |   Pins 1 & 2   | Closed |
   |                 |     closed     |     closed     |        |
   |-----------------+----------------+----------------+--------|
   | 80486SX (PQFP)  |      Open      |   Pins 2 & 3   |  Open  |
   |                 |                |     closed     |        |
   |-----------------+----------------+----------------+--------|
   |  80486SX (PGA)  |      Open      |   Pins 2 & 3   |  Open  |
   |                 |                |     closed     |        |
   |-----------------+----------------+----------------+--------|
   |    ODP486SX     |   Pins 2 & 3   |   Pins 1 & 2   | Closed |
   |                 |     closed     |     closed     |        |
   |-----------------+----------------+----------------+--------|
   |     80487SX     |   Pins 2 & 3   |   Pins 1 & 2   | Closed |
   |                 |     closed     |     closed     |        |
   |-----------------+----------------+----------------+--------|
   |    AMD486DX     |   Pins 1 & 2   |   Pins 1 & 2   | Closed |
   |                 |     closed     |     closed     |        |
   |-----------------+----------------+----------------+--------|
   |     80486DX     |   Pins 1 & 2   |   Pins 1 & 2   | Closed |
   |                 |     closed     |     closed     |        |
   |-----------------+----------------+----------------+--------|
   |    80486DX2     |   Pins 1 & 2   |   Pins 1 & 2   | Closed |
   |                 |     closed     |     closed     |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |     Speed     |     JP20     |     JP21     |     JP22     |
   |---------------+--------------+--------------+--------------|
   |     25MHz     |    Closed    |     Open     |     Open     |
   |---------------+--------------+--------------+--------------|
   |     33MHz     |     Open     |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |     40MHz     |     Open     |    Closed    |    Closed    |
   |---------------+--------------+--------------+--------------|
   |    50iMHz     |    Closed    |     Open     |     Open     |
   |---------------+--------------+--------------+--------------|
   |     50MHz     |     Open     |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   |    66iMHz     |     Open     |     Open     |    Closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |         VESA WAIT STATE CONFIGURATION (SCSL ONLY)          |
   |------------------------------------------------------------|
   |        Wait states         |            JP9/11             |
   |----------------------------+-------------------------------|
   |       0 wait states        |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |        1 wait state        |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            BUS SPEED CONFIGURATION (SCSL ONLY)             |
   |------------------------------------------------------------|
   |         CPU speed          |            JP8/10             |
   |----------------------------+-------------------------------|
   |          <= 33MHz          |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          > 33MHz           |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+