ABIT COMPUTER CORPORATION
=========================

   AR4

   Processor         80486SX/80487SX/80486DX/80486DX2             
   Processor Speed   40/50(internal)/60/66(internal)MHz           
   Chip Set          ALI                                          
   Max. Onboard DRAM 32MB                                         
   Cache             None                                         
   BIOS              Award                                        
   Dimensions        330mm x 218mm                                
   I/O Options       None                                         
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/S-T/35063-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | External battery  |    J4    | Turbo switch/LED |   J21    |
   |-------------------+----------+------------------+----------|
   | Reset switch      |   J19    | Keylock          |   J22    |
   |-------------------+----------+------------------+----------|
   | Speaker           |   J20    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Monitor type select color        |  JP1   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |  JP1   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Factory configured - do not      |  JP2   |     on     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |   | CPU set at 80486SX (PQFP)        |  JP7   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CPU set at 80486SX (PGA)         |  JP7   | pins 2 & 3 |
   |   |                                  |        |   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        |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |     CPU Type     |        JP4         |        JP5         |
   |------------------+--------------------+--------------------|
   |     80486SX      |        Open        |  pin 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |     80487SX      | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |     80486DX      | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |     80486DX2     | pins 2 & 3 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 AT BUS CLOCK CONFIGURATION                 |
   |------------------------------------------------------------|
   |      Speed       |        JP3         |        JP6         |
   |------------------+--------------------+--------------------|
   |      40MHz       | pins 2 & 3 closed  | pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |      50MHz       | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |      66MHz       | pins 1 & 2 closed  | pins 1 & 2 closed  |
   +------------------------------------------------------------+