FOREX COMPUTER CORPORATION
==========================

   386/486 CACHE SYSTEM BOARD

   Processor    80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2 
   Processor    20/25/33/40/50(internal)/50/66(internal) MHz      
   Speed        
   Chip Set     Forex                                             
   Max. onboard 32MB                                              
   DRAM         
   Cache        64/128/256KB                                      
   BIOS         AMI                                               
   Dimensions   330mm x 218mm                                     
   I/O Options  32-bit local bus slot                             
   NPU Options  80387DX                                           

<gopher://bitreich.org/I/th99/m/E-H/31611-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | External battery  |   JP2    | Speaker          |   JP10   |
   |-------------------+----------+------------------+----------|
   | Reset switch      |   JP8    | Turbo switch     |   JP15   |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   JP9    | 32-bit Local bus |    S1    |
   | keylock           |          | slot             |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Function                | Jumper | Position |
   |----------------------------------------+--------+----------|
   |>> | Factory configured - do not alter  |  JP5   |   N/A    |
   |---+------------------------------------+--------+----------|
   |>> | CMOS memory normal operation       |  JP6   |  Closed  |
   |---+------------------------------------+--------+----------|
   |   | CMOS memory clear                  |  JP6   |   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        |
   |------------------+--------------------+--------------------|
   |       5MB        |    (4) 256K x 9    |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       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  |  (2) 8K x 8   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |    JP8A    |   JP8B   |   JP8C   |  JP8E  |  JP8F  |
   |-------+------------+----------+----------+--------+--------|
   | 64KB  | pins 2 & 3 | pins 1 & | pins 1 & | pins 2 | pins 1 |
   |       |            |    2     |    2     |  & 3   |  & 2   |
   |-------+------------+----------+----------+--------+--------|
   | 128KB | pins 1 & 2 | pins 2 & | pins 2 & | pins 1 | pins 1 |
   |       |            |    3     |    3     |  & 2   |  & 2   |
   |-------+------------+----------+----------+--------+--------|
   | 256KB | pins 2 & 3 | pins 1 & | pins 1 & | pins 1 | pins 2 |
   |       |            |    2     |    2     |  & 2   |  & 3   |
   |------------------------------------------------------------|
   | Note:Pins designated should be in the closed position.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   | Speed |    JP7A     |    JP7B    |    JP7C    |    JP7D    |
   |-------+-------------+------------+------------+------------|
   | 20MHz | pins 2 & 3  | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 25MHz | pins 1 & 2  | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 33MHz | pins 1 & 2  | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 40MHz | pins 2 & 3  | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 50MHz | pins 2 & 3  | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 66MHz | pins 1 & 2  | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 80MHz | pins 2 & 3  | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
   |       |   closed    |   closed   |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type   |   W1B   |  W1A -  |   W2A   |   W2A   |  W2C -  |
   |          |         |   W1G   |         |         |   W2H   |
   |----------+---------+---------+---------+---------+---------|
   | 80386DX  | pins 2  | pins 2  | pins 2  | pins 2  | pins 2  |
   |          |   & 3   |   & 3   |   & 3   |   & 3   |   & 3   |
   |----------+---------+---------+---------+---------+---------|
   | CX486DLC | pins 2  | pins 2  | pins 2  | pins 2  | pins 2  |
   |          |   & 3   |   & 3   |   & 3   |   & 3   |   & 3   |
   |----------+---------+---------+---------+---------+---------|
   |  80486   | pins 1  | pins 1  | pins 1  | pins 1  | pins 1  |
   |          |   & 2   |   & 2   |   & 2   |   & 2   |   & 2   |
   |------------------------------------------------------------|
   |      Notes:Pins designated should be in the closed         |
   |      position.                                             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                80486 CPU TYPE CONFIGURATION                |
   |------------------------------------------------------------|
   |   Type   |      JP12      |      JP13      |     JP30      |
   |----------+----------------+----------------+---------------|
   | 80486SX  |   pins 2 & 3   |   pins 2 & 3   |  pins 2 & 3   |
   |          |     closed     |     closed     |    closed     |
   |----------+----------------+----------------+---------------|
   | 80487SX  |   pins 1 & 2   |   pins 2 & 3   |  pins 2 & 3   |
   |          |     closed     |     closed     |    closed     |
   |----------+----------------+----------------+---------------|
   | 80486DX  |   pins 1 & 2   |   pins 1 & 2   |  pins 1 & 2   |
   |          |     closed     |     closed     |    closed     |
   |----------+----------------+----------------+---------------|
   | 80486DX2 |   pins 1 & 2   |   pins 1 & 2   |  pins 1 & 2   |
   |          |     closed     |     closed     |    closed     |
   +------------------------------------------------------------+