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       # FOREX COMPUTER CORPORATION
       
          FOREX 486 (REV. VL3H)
       
          Processor        80486SX/80487SX/80486DX/80486DX2/P23T/P24T    
          Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz   
          Chip Set         Forex                                         
          Video Chip Set   None                                          
          Maximum Onboard  32MB                                          
          Memory           
          Maximum Video    None                                          
          Memory           
          Cache            64/128/256KB                                  
          BIOS             AMI                                           
          Dimensions       260mm x 220mm                                 
          I/O Options      32-bit VESA local bus slots (3), green PC     
                           connector                                     
          NPU Options      None                                          
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose       | Location | Purpose              | Location |
          |---------------+----------+----------------------+----------|
          | Turbo LED     |    J6    | External battery     |   JP1    |
          |---------------+----------+----------------------+----------|
          | Speaker       |    J7    | Green PC connector   |   JP14   |
          |---------------+----------+----------------------+----------|
          | Turbo switch  |    J8    | Green PC LED         |   JP15   |
          |---------------+----------+----------------------+----------|
          | Power LED &   |    J9    | 32-bit VESA local    |  SL1 –   |
          | keylock       |          | bus slots            |   SL3    |
          |---------------+----------+----------------------+----------|
          | Reset switch  |   J10    |                      |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Label |   Position    |
          |------------------------------------+-------+---------------|
          |   | PQFP CPU enabled               |  JP5  |     Open      |
          |---+--------------------------------+-------+---------------|
          |   | PQFP CPU disabled              |  JP5  |    Closed     |
          |---+--------------------------------+-------+---------------|
          | » | CMOS memory normal operation   |  JP6  | Unidentified  |
          |---+--------------------------------+-------+---------------|
          |   | CMOS memory clear              |  JP6  | Unidentified  |
          |---+--------------------------------+-------+---------------|
          |   | Green PC disabled              | JP13  |     Open      |
          |---+--------------------------------+-------+---------------|
          |   | Green PC enabled               | JP13  |    Closed     |
          |---+--------------------------------+-------+---------------|
          |   | Green clock speed select 8MHz  | JP16  |  Pins 2 & 3   |
          |   |                                |       |    closed     |
          |---+--------------------------------+-------+---------------|
          |   | Green clock speed select 16MHz | JP16  |  Pins 1 & 2   |
          |   |                                |       |    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        |
          |------------------+--------------------+--------------------|
          |       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  | (1) 16K/32K x 8 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  |      JP8A       |      JP8B       |      JP8C      |
          |-------+-----------------+-----------------+----------------|
          | 64KB  |   Pins 2 & 3    |   Pins 1 & 2    |   Pins 2 & 3   |
          |       |     closed      |     closed      |     closed     |
          |-------+-----------------+-----------------+----------------|
          | 128KB |   Pins 1 & 2    |   Pins 2 & 3    |   Pins 1 & 2   |
          |       |     closed      |     closed      |     closed     |
          |-------+-----------------+-----------------+----------------|
          | 256KB |   Pins 1 & 2    |   Pins 1 & 2    |   Pins 1 & 2   |
          |       |     closed      |     closed      |     closed     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CPU SPEED SELECTION                     |
          |------------------------------------------------------------|
          |     Speed     |     JP7A     |     JP7B     |     JP7C     |
          |---------------+--------------+--------------+--------------|
          |     20MHz     |     Open     |    Closed    |    Closed    |
          |---------------+--------------+--------------+--------------|
          |     25MHz     |    Closed    |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |     33MHz     |     Open     |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |     40MHz     |    Closed    |    Closed    |     Open     |
          |---------------+--------------+--------------+--------------|
          |    50iMHz     |    Closed    |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |     50MHz     |     Open     |    Closed    |     Open     |
          |---------------+--------------+--------------+--------------|
          |    66iMHz     |     Open     |     Open     |     Open     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     CPU TYPE SELECTION                     |
          |------------------------------------------------------------|
          |   Type    |    JP2     |    JP3    |    JP4    |   JP12    |
          |-----------+------------+-----------+-----------+-----------|
          |  80486SX  | Pins 2 & 3 | Pins 2 &  | Pins 2 &  | Pins 1 &  |
          |           |   closed   | 3 closed  | 3 closed  | 2 closed  |
          |-----------+------------+-----------+-----------+-----------|
          |  80487SX  | Pins 2 & 3 | Pins 1 &  | Pins 1 &  | Pins 1 &  |
          |           |   closed   | 2 closed  | 2 closed  | 2 closed  |
          |-----------+------------+-----------+-----------+-----------|
          |  80486DX  | Pins 2 & 3 | Pins 2 &  | Pins 2 &  | Pins 1 &  |
          |  (PQFP)   |   closed   | 3 closed  | 3 closed  | 2 closed  |
          |-----------+------------+-----------+-----------+-----------|
          |  80486DX  | Pins 1 & 2 | Pins 1 &  | Pins 1 &  | Pins 1 &  |
          |   (PGA)   |   closed   | 2 closed  | 2 closed  | 2 closed  |
          |-----------+------------+-----------+-----------+-----------|
          | 80486DX2  | Pins 1 & 2 | Pins 1 &  | Pins 1 &  | Pins 1 &  |
          |           |   closed   | 2 closed  | 2 closed  | 2 closed  |
          |-----------+------------+-----------+-----------+-----------|
          |   P23T    | Pins 2 & 3 | Pins 1 &  | Pins 1 &  | Pins 1 &  |
          |           |   closed   | 2 closed  | 2 closed  | 2 closed  |
          |-----------+------------+-----------+-----------+-----------|
          |   P24T    | Pins 1 & 2 | Pins 1 &  | Pins 1 &  | Pins 2 &  |
          |           |   closed   | 2 closed  | 2 closed  | 3 closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              CPU TYPE SELECTION (CYRIX ONLY)               |
          |------------------------------------------------------------|
          |             Type              |            JP20            |
          |-------------------------------+----------------------------|
          |            CX486DX            |            Open            |
          |-------------------------------+----------------------------|
          |           CX486DX2            |           Closed           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                VL BUS WAIT STATE SELECTION                 |
          |------------------------------------------------------------|
          |          Setting           |             JP10              |
          |----------------------------+-------------------------------|
          |             0              |       Pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |             1              |       Pins 2 & 3 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   VL BUS SPEED SELECTION                   |
          |------------------------------------------------------------|
          |           Speed            |             JP11              |
          |----------------------------+-------------------------------|
          |          <= 33MHz          |       Pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |          >33 MHz           |       Pins 2 & 3 closed       |
          +------------------------------------------------------------+