CHICONY, INC.
=============

   CH-491E

  Processor  CX486S/80486SDX/CX487S/80487SX/CX486DX/AM486DX/80486DX/ 
             CX486DX2/AM486DX2/80486DX2/Pentium Overdrive            
  Processor  20/25/33/40/50(internal)/50/66(internal)MHz             
  Speed      
  Chip Set   Advanced                                                
  Max.       64MB                                                    
  Onboard    
  DRAM       
  Cache      32/64/128/256KB                                         
  BIOS       AMI                                                     
  Dimensions 220mm x 250mm                                           
  I/O        32-bit VESA local bus slots (3)                         
  Options    
  NPU        None                                                    
  Options    

<gopher://bitreich.org/I/th99/m/C-D/33031-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |    J3    | Speaker           |    J7    |
   |------------------+----------+-------------------+----------|
   | Reset switch     |    J4    | Power LED &       |    J8    |
   |                  |          | keylock           |          |
   |------------------+----------+-------------------+----------|
   | Turbo switch     |    J5    | 32-bit VESA local |  SL1 -   |
   |                  |          | bus slots         |   SL3    |
   |------------------+----------+-------------------+----------|
   | Turbo LED        |    J6    |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | CMOS memory normal operation     |  JP1   |    Open    |
   |---+----------------------------------+--------+------------|
   |   | CMOS memory clear                |  JP1   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Address strobe delay disabled    |  JP7   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Address strobe delay enabled     |  JP7   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | PQFP CPU enabled                 |  JP12  |    Open    |
   |---+----------------------------------+--------+------------|
   |   | PQFP CPU disabled                |  JP12  |   Closed   |
   |---+----------------------------------+--------+------------|
   |>> | VGA card select normal card      |  JP19  | pins 1 & 2 |
   |   | installed                        |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | VGA card select Weitek Power     |  JP19  | pins 2 & 3 |
   |   | 9000 card installed              |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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     |
   |------------------+--------------------+--------------------|
   |       5MB        |     (4) 1M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       5MB        |    (4) 256K x 9    |     (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     |
   |------------------+--------------------+--------------------|
   |       17MB       |     (4) 4M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       64MB       |    (4) 16M x 9     |        NONE        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1    |          TAG           |
   |-------+-------------+-------------+------------------------|
   | 32KB  | (4) 8K x 8  |    NONE     |       (1) 8K x 8       |
   |-------+-------------+-------------+------------------------|
   | 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   |   JP2   |   JP3   |   JP4   |   JP5   |   JP6   |
   |----------+---------+---------+---------+---------+---------|
   |   32KB   |  2 & 3  |  2 & 3  |  Open   |  Open   |  Open   |
   |----------+---------+---------+---------+---------+---------|
   |   64KB   |  1 & 2  |  1 & 2  |  Open   |  Open   | Closed  |
   |----------+---------+---------+---------+---------+---------|
   |  128KB   |  2 & 3  |  2 & 3  |  Open   | Closed  | Closed  |
   |----------+---------+---------+---------+---------+---------|
   |  256KB   |  1 & 2  |  1 & 2  | Closed  | Closed  | Closed  |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type    |     JP15     |  JP16  |  JP17  | JP18  | JP20  |
   |-----------+--------------+--------+--------+-------+-------|
   |  CX486S   |    2 & 3     |  Open  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   |  80486SX  |    2 & 3     |  Open  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   |  CX487S   | 1 & 2, 3 & 4 | 1 & 2  |  Open  | 1 & 2 | 1 & 2 |
   |-----------+--------------+--------+--------+-------+-------|
   |  80487SX  | 1 & 2, 3 & 4 | 2 & 3  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   |  CX486DX  | 1 & 2, 3 & 4 | 1 & 2  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   | AM80486DX | 1 & 2, 3 & 4 | 1 & 2  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   |  80486DX  | 1 & 2, 3 & 4 | 1 & 2  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   | CX486DX2  | 1 & 2, 3 & 4 | 1 & 2  | Closed | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   | AM486DX2  | 1 & 2, 3 & 4 | 1 & 2  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   | 80486DX2  | 1 & 2, 3 & 4 | 1 & 2  |  Open  | 2 & 3 | 2 & 3 |
   |-----------+--------------+--------+--------+-------+-------|
   |   P24T    | 1 & 2, 3 & 4 | 1 & 2  |  Open  | 2 & 3 | 2 & 3 |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Speed    |    JP8    |    JP9    |   JP10    |   JP11    |
   |------------+-----------+-----------+-----------+-----------|
   |   20Mhz    |  Closed   |  Closed   |  Closed   |  Closed   |
   |------------+-----------+-----------+-----------+-----------|
   |   25MHz    |   Open    |   Open    |  Closed   |  Closed   |
   |------------+-----------+-----------+-----------+-----------|
   |   33MHz    |   Open    |   Open    |  Closed   |   Open    |
   |------------+-----------+-----------+-----------+-----------|
   |   40MHz    |   Open    |   Open    |   Open    |  Closed   |
   |------------+-----------+-----------+-----------+-----------|
   |   50iMHz   |   Open    |   Open    |  Closed   |  Closed   |
   |------------+-----------+-----------+-----------+-----------|
   |   50MHz    |   Open    |   Open    |   Open    |   Open    |
   |------------+-----------+-----------+-----------+-----------|
   |   66iMHz   |   Open    |   Open    |  Closed   |   Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              VL BUS WAIT STATE CONFIGURATION               |
   |------------------------------------------------------------|
   |          Wait states          |            JP13            |
   |-------------------------------+----------------------------|
   |         0 wait states         |            Open            |
   |-------------------------------+----------------------------|
   |         1 wait state          |           Closed           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 VL BUS SPEED CONFIGURATION                 |
   |------------------------------------------------------------|
   |           CPU speed           |            JP14            |
   |-------------------------------+----------------------------|
   |           <= 33MHz            |            Open            |
   |-------------------------------+----------------------------|
   |            > 33MHz            |           Closed           |
   +------------------------------------------------------------+