MICRO EXPRESS, INC.
===================

   FOREX 486 CACHE

   Processor         80486SX/80487SX/80486DX/80486DX2             
   Processor Speed   20/25/33/50 (internal)/50/66 (internal)MHz   
   Chip Set          FOREX                                        
   Max. onboard DRAM 32MB                                         
   Cache             64/128/256KB                                 
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       32-bit VESA local bus slots (2)              
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/31658-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |   JP2    | Turbo switch      |   JP15   |
   |------------------+----------+-------------------+----------|
   | Reset switch     |   JP3    | Turbo LED         |   JP16   |
   |------------------+----------+-------------------+----------|
   | Power LED &      |   JP9    | 32-bit VESA local |    S1    |
   | keylock          |          | bus slot          |          |
   |------------------+----------+-------------------+----------|
   | Speaker          |   JP10   | 32-bit VESA local |    S2    |
   |                  |          | bus slot          |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Function             | Jumper/Switch | Position |
   |---------------------------------+---------------+----------|
   |>> | Factory configured - do not |      JP5      |   N/A    |
   |   | alter                       |               |          |
   |---+-----------------------------+---------------+----------|
   |>> | CMOS memory normal          |      JP6      |   Open   |
   |   | operation                   |               |          |
   |---+-----------------------------+---------------+----------|
   |   | CMOS memory clear           |      JP6      |  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 4   |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |     NONE      |  (1) 8K x 4   |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 4  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |    JP8A     |    JP8B    |    JP8D    |    JP8E    |
   |-------+-------------+------------+------------+------------|
   | 64KB  | pins 1 & 2  | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 128KB | pins 2 & 3  | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 256KB | pins 2 & 3  | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
   |       |   closed    |   closed   |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |  VESA WAIT STATE/BUS SPEED (ID2 &AMP; ID3) CONFIGURATION   |
   |------------------------------------------------------------|
   | CPU speed  |  Wait states   |  JP102 (ID2)   | JP103 (ID3) |
   |------------+----------------+----------------+-------------|
   |  GBP 33MHz   | 0 wait states  |   pins 1 & 2   | pins 1 & 2  |
   |            |                |     closed     |   closed    |
   |------------+----------------+----------------+-------------|
   |  > 33MHz   |  1 wait state  |   pins 2 & 3   | pins 2 & 3  |
   |            |                |     closed     |   closed    |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |     Type      |   JP12    |   JP13   |   JP29   |   JP30   |
   |---------------+-----------+----------+----------+----------|
   | 80486SX/PQFP  | pins 2 &  | pins 2 & | pins 2 & | pins 2 & |
   |               | 3 closed  | 3 closed | 3 closed | 3 closed |
   |---------------+-----------+----------+----------+----------|
   |  80486SX/PGA  | pins 2 &  | pins 2 & | pins 2 & | pins 2 & |
   |               | 3 closed  | 3 closed | 3 closed | 3 closed |
   |---------------+-----------+----------+----------+----------|
   |  80487SX/PGA  | pins 1 &  | pins 1 & | pins 2 & | pins 2 & |
   |               | 2 closed  | 2 closed | 3 closed | 3 closed |
   |---------------+-----------+----------+----------+----------|
   | 80486DX/PQFP  | pins 2 &  | pins 2 & | pins 2 & | pins 2 & |
   |               | 3 closed  | 3 closed | 3 closed | 3 closed |
   |---------------+-----------+----------+----------+----------|
   |  80486DX/PGA  | pins 1 &  | pins 1 & | pins 1 & | pins 1 & |
   |               | 2 closed  | 2 closed | 2 closed | 2 closed |
   |---------------+-----------+----------+----------+----------|
   | 80486DX2/PQFP | pins 2 &  | pins 2 & | pins 2 & | pins 2 & |
   |               | 3 closed  | 3 closed | 3 closed | 3 closed |
   |---------------+-----------+----------+----------+----------|
   | 80486DX2/PGA  | pins 1 &  | pins 1 & | pins 1 & | pins 1 & |
   |               | 2 closed  | 2 closed | 2 closed | 2 closed |
   +------------------------------------------------------------+