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       # EVEREX SYSTEMS, INC.
       
          STEP ISA VL (EV-18211)
       
          Processor         80486SX/80487SX/80486DX                      
          Processor Speed   20/25/33/50MHZ                               
          Chip Set          Compaq                                       
          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                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose      | Location | Purpose               | Location |
          |--------------+----------+-----------------------+----------|
          | Turbo LED    |   JP10   | External battery      |   JP17   |
          |--------------+----------+-----------------------+----------|
          | Speaker      |   JP11   | Turbo switch          |   JP32   |
          |--------------+----------+-----------------------+----------|
          | Power LED &  |   JP13   | 32-bit VESA Local bus |    S1    |
          | keylock      |          | slot                  |          |
          |--------------+----------+-----------------------+----------|
          | Reset switch |   JP15   | 32-bit VESA Local bus |    S2    |
          |              |          | slot                  |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |           Function            | Jumper/Switch |  Position  |
          |-------------------------------+---------------+------------|
          | » | Factory configured - do   |      JP1      |   Closed   |
          |   | not alter                 |               |            |
          |---+---------------------------+---------------+------------|
          | » | Fast gate A20 normal      |      JP9      | pins 2 & 3 |
          |   | operation                 |               |   closed   |
          |---+---------------------------+---------------+------------|
          |   | Fast gate A20 select      |      JP9      | pins 1 & 2 |
          |   | alternate                 |               |   closed   |
          |---+---------------------------+---------------+------------|
          | » | Monitor type select color |     JP12      |   Closed   |
          |---+---------------------------+---------------+------------|
          |   | Monitor type select       |     JP12      |    Open    |
          |   | monochrome                |               |            |
          |---+---------------------------+---------------+------------|
          | » | CMOS memory normal        |     JP16      | pins 1 & 2 |
          |   | operation                 |               |   closed   |
          |---+---------------------------+---------------+------------|
          |   | CMOS memory clear         |     JP16      | pins 2 & 3 |
          |   |                           |               |   closed   |
          |---+---------------------------+---------------+------------|
          | » | CPU select 2 wait states  |     JP29      | pins 2 & 3 |
          |   |                           |               |   closed   |
          |---+---------------------------+---------------+------------|
          |   | CPU select 1 wait state   |     JP29      | pins 1 & 2 |
          |   |                           |               |   closed   |
          |---+---------------------------+---------------+------------|
          | » | LCLK gate select 1 wait   |     JP36      | pins 1 & 2 |
          |   | state                     |               |   closed   |
          |---+---------------------------+---------------+------------|
          |   | LCLK gate select 2 wait   |     JP36      | pins 2 & 3 |
          |   | state                     |               |   closed   |
          |---+---------------------------+---------------+------------|
          | » | CPUADS select 0 wait      |     JP38      | pins 1 & 2 |
          |   | states                    |               |   closed   |
          |---+---------------------------+---------------+------------|
          |   | CPUADS select 1 wait      |     JP38      | pins 2 & 3 |
          |   | state                     |               |   closed   |
          |---+---------------------------+---------------+------------|
          | » | Factory configured - do   |     JP100     |    Open    |
          |   | not alter                 |               |            |
          |---+---------------------------+---------------+------------|
          | » | Factory configured - do   |     JP101     |    Open    |
          |   | not alter                 |               |            |
          |---+---------------------------+---------------+------------|
          | » | Factory configured - do   |     JP102     | pins 2 & 3 |
          |   | not alter                 |               |   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        |
          |------------------+--------------------+--------------------|
          |       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) 32K x 8  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  |       JP6       |       JP7       |      JP8       |
          |-------+-----------------+-----------------+----------------|
          | 64KB  |   pins 2 & 3    |   pins 2 & 3    |   pins 2 & 4   |
          |       |     closed      |     closed      |     closed     |
          |-------+-----------------+-----------------+----------------|
          | 128KB |   pins 2 & 3    |   pins 1 & 2    |   pins 2 & 3   |
          |       |     closed      |     closed      |     closed     |
          |-------+-----------------+-----------------+----------------|
          | 256KB |   pins 1 & 2    |   pins 1 & 2    |   pins 1 & 2   |
          |       |     closed      |     closed      |     closed     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |  VESA WAIT STATE/BUS SPEED (ID2 & ID3) CONFIGURATION   |
          |------------------------------------------------------------|
          |   CPU speed   |   Wait states    |    ID3     |    ID2     |
          |---------------+------------------+------------+------------|
          |    £ 33MHz    |  0 wait states   |    Open    |    Open    |
          |---------------+------------------+------------+------------|
          |    > 33MHz    |   1 wait state   |   Closed   |   Closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |           Speed            |             JP30              |
          |----------------------------+-------------------------------|
          |           20MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |           25MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |           33MHz            |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |           50MHz            |       pins 1 & 2 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |  Type   |        JP2        |  JP3   |    JP4     |  JP5   |
          |---------+-------------------+--------+------------+--------|
          | 80486SX | pins 1 & 2 closed |  Open  |    Open    |  Open  |
          |---------+-------------------+--------+------------+--------|
          | 80487SX | pins 2 & 3 closed | Closed | pins 1 & 2 | Closed |
          |         |                   |        |   closed   |        |
          |---------+-------------------+--------+------------+--------|
          | 80486DX | pins 2 & 3 closed | Closed | pins 2 & 3 |  Open  |
          |         |                   |        |   closed   |        |
          +------------------------------------------------------------+