UNIDENTIFIED
============

   486-VESA

   Processor         CX486S/80486SX/80486DX/80486DX2              
   Processor Speed   20/25/33/40/50 (internal)/50MHz              
   Chip Set          PC Chips                                     
   Max. Onboard DRAM 32MB                                         
   Cache             64/128/256KB                                 
   BIOS              AMI                                          
   Dimensions        250mm x 220mm                                
   I/O Options       32-bit VESA local bus slots (2)              
   NPU Options       4167                                         

<gopher://bitreich.org/I/th99/m/U-Z/30190-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | External      |    J1    | Turbo LED            |   J23    |
   | battery       |          |                      |          |
   |---------------+----------+----------------------+----------|
   | Turbo switch  |    J3    | Power LED & keylock  |   J24    |
   |---------------+----------+----------------------+----------|
   | Speaker       |   J21    | Weitek daughtercard  |    W1    |
   |               |          | connector            |          |
   |---------------+----------+----------------------+----------|
   | Reset switch  |   J22    | 32-bit VESA local    |  SL1 &   |
   |               |          | bus slots            |   SL2    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Monitor type select color        |   J2   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |   J2   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Fast gate A20 mode enabled       |  J13   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Fast gate A20 mode disabled      |  J13   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  J25   |   Closed   |
   |   | alter                            |        |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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) 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     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   | Setting  |    J18     |    J19     |          J20          |
   |----------+------------+------------+-----------------------|
   | CX486S2  | pins 2 & 3 | pins 2 & 3 |   pins 2 & 3 closed   |
   |          |   closed   |   closed   |                       |
   |----------+------------+------------+-----------------------|
   | 80486SX  | pins 2 & 3 | pins 2 & 3 |   pins 2 & 3 closed   |
   |          |   closed   |   closed   |                       |
   |----------+------------+------------+-----------------------|
   | 80486DX  | pins 1 & 2 | pins 1 & 2 |   pins 1 & 2, 3 & 4   |
   |          |   closed   |   closed   |        closed         |
   |----------+------------+------------+-----------------------|
   | 80486DX2 | pins 1 & 2 | pins 1 & 2 |   pins 1 & 2, 3 & 4   |
   |          |   closed   |   closed   |        closed         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    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  |       J4        |       J5        |       J6       |
   |-------+-----------------+-----------------+----------------|
   | 64KB  |   pins 2 & 3    |   pins 2 & 3    |   pins 2 & 3   |
   |       |     closed      |     closed      |     closed     |
   |-------+-----------------+-----------------+----------------|
   | 128KB |   pins 1 & 2    |   pins 1 & 2    |   pins 2 & 3   |
   |       |     closed      |     closed      |     closed     |
   |-------+-----------------+-----------------+----------------|
   | 256KB |   pins 1 & 2    |   pins 1 & 2    |   pins 1 & 2   |
   |       |     closed      |     closed      |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               CACHE WRITE MODE CONFIGURATION               |
   |------------------------------------------------------------|
   |     Mode      | Size  |    J15     |    J16    |    J17    |
   |---------------+-------+------------+-----------+-----------|
   | Write-through |  Any  | pins 2 & 3 | pins 1 &  | pins 1 &  |
   |               |       |   closed   | 2 closed  | 2 closed  |
   |---------------+-------+------------+-----------+-----------|
   |  Write-back   | 64KB  | pins 2 & 3 | pins 1 &  | pins 2 &  |
   |               |       |   closed   | 2 closed  | 3 closed  |
   |---------------+-------+------------+-----------+-----------|
   |  Write-back   | 128KB | pins 2 & 3 | pins 2 &  | pins 1 &  |
   |               |       |   closed   | 3 closed  | 2 closed  |
   |---------------+-------+------------+-----------+-----------|
   |  Write-back   | 256KB | pins 1 & 2 | pins 1 &  | pins 1 &  |
   |               |       |   closed   | 2 closed  | 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               VESA WAIT STATE CONFIGURATION                |
   |------------------------------------------------------------|
   |    Wait states     |        J12         |       J26        |
   |--------------------+--------------------+------------------|
   |   0 wait states    | pins 2 & 3 closed  |       Open       |
   |--------------------+--------------------+------------------|
   |    1 wait state    | pins 1 & 2 closed  |      Closed      |
   +------------------------------------------------------------+