GIGA-BYTE TECHNOLOGY CO., LTD.
==============================

   GA-486PA

   Processor         80486SX/80486DX/80486DX2                     
   Processor Speed   16/20/25/33/50(internal)/50/66(internal)MHz  
   Chip Set          OPTi                                         
   Max. Onboard DRAM 32MB                                         
   Cache             64/128/256/512KB                             
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       None                                         
   NPU Options       4167                                         

<gopher://bitreich.org/I/th99/m/E-H/31805-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             | Location | Purpose        | Location |
   |---------------------+----------+----------------+----------|
   | Power LED & keylock |    J1    | Turbo switch   |    J4    |
   |---------------------+----------+----------------+----------|
   | Reset switch        |    J2    | Turbo LED      |    J5    |
   |---------------------+----------+----------------+----------|
   | Speaker             |    J3    |                |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper  | Position  |
   |--------------------------------------+---------+-----------|
   |>> | Monitor type select color        |   J23   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |   | Monitor type select monochrome   |   J23   |   Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       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   |  (2) 32K x 1  |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |     NONE      |  (2) 32K x 1  |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (2) 32K x 1  |
   |------------+---------------+---------------+---------------|
   |   512KB    | (4) 128K x 8  |     NONE      |  (2) 32K x 1  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |  Size   |        JP8        |   JP17   |  JP18   |  JP19   |
   |---------+-------------------+----------+---------+---------|
   |  64KB   | pins 2 & 3 closed |   Open   |  Open   |  Open   |
   |---------+-------------------+----------+---------+---------|
   |  128KB  | pins 1 & 2 closed |  Closed  |  Open   |  Open   |
   |---------+-------------------+----------+---------+---------|
   |  256KB  | pins 2 & 3 closed |  Closed  | Closed  |  Open   |
   |---------+-------------------+----------+---------+---------|
   |  512KB  | pins 1 & 2 closed |  Closed  | Closed  | Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |            Type            |              J7               |
   |----------------------------+-------------------------------|
   |          80486SX           |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          80486DX           |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |          80486DX2          |       pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |            Speed             |             J6              |
   |------------------------------+-----------------------------|
   |            16MHz             |           Closed            |
   |------------------------------+-----------------------------|
   |            20MHz             |           Closed            |
   |------------------------------+-----------------------------|
   |            25MHz             |            Open             |
   |------------------------------+-----------------------------|
   |            33MHz             |            Open             |
   |------------------------------+-----------------------------|
   |            50iMHz            |            Open             |
   |------------------------------+-----------------------------|
   |            50MHz             |            Open             |
   |------------------------------+-----------------------------|
   |            66iMHz            |            Open             |
   +------------------------------------------------------------+