PEAKTRON COMPUTER, INC.
=======================

   486DX-25/33, 486SX-20

   Processor             80486SX/80486DX                          
   Processor Speed       20/25/33MHz                              
   Chip Set              Peaktron                                 
   Max. Onboard DRAM     32MB                                     
   Cache                 None                                     
   BIOS                  AMI                                      
   Dimensions            330mm x 218mm                            
   I/O Options           None                                     
   NPU Options           None                                     

<gopher://bitreich.org/I/th99/m/P-R/30315-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose        | Location | Purpose             | Location |
   |----------------+----------+---------------------+----------|
   | Reset switch   |    J1    | Speaker             |    J4    |
   |----------------+----------+---------------------+----------|
   | Turbo switch   |    J2    | Power LED & Keylock |    J5    |
   |----------------+----------+---------------------+----------|
   | Turbo LED      |    J3    | External battery    |   JP4    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |           Function            | Jumper/Switch |  Position  |
   |-------------------------------+---------------+------------|
   |>> | Parity check enabled      |      J6       |   Closed   |
   |---+---------------------------+---------------+------------|
   |   | Parity check disabled     |      J6       |    Open    |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      J8       |    N/A     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Monitor type select       |      J10      |    Open    |
   |   | monochrome                |               |            |
   |---+---------------------------+---------------+------------|
   |   | Monitor type select color |      J10      |   Closed   |
   |---+---------------------------+---------------+------------|
   |>> | CPU speed select          |      JP1      | pins 1 & 2 |
   |   | switchable at turbo       |               |   closed   |
   |   | switch                    |               |            |
   |---+---------------------------+---------------+------------|
   |   | CPU speed select forced   |      JP1      | pins 2 & 3 |
   |   | fast                      |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | CPU speed select forced   |      JP1      |    Open    |
   |   | slow                      |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      JP5      |    N/A     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | 20/25MHz CPU using 70ns   |      JP6      |    Open    |
   |   | DRAM or33MHz CPU using    |               |            |
   |   | 60ns                      |               |            |
   |---+---------------------------+---------------+------------|
   |   | 20/25MHz CPU using 60ns   |      JP6      |   Closed   |
   |   | DRAM                      |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Shadow BIOS disabled      |     SW1/5     |   Closed   |
   |---+---------------------------+---------------+------------|
   |   | Shadow BIOS enabled       |     SW1/5     |    Open    |
   |---+---------------------------+---------------+------------|
   |>> | Bus speed select ATCLK/3  |     SW1/6     |    Open    |
   |---+---------------------------+---------------+------------|
   |   | Bus speed select ATCLK/4  |     SW1/6     |   Closed   |
   |------------------------------------------------------------|
   | Note:Location of JP6 is unverified. If using 8 bit SIMMs,  |
   | J6 must be open.                                           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   | Size |    SW1/1    |    SW1/2    |   SW1/3    |   SW1/4    |
   |------+-------------+-------------+------------+------------|
   | 1MB  |   Closed    |    Open     |    Open    |   Closed   |
   |------+-------------+-------------+------------+------------|
   | 2MB  |    Open     |    Open     |    Open    |   Closed   |
   |------+-------------+-------------+------------+------------|
   | 4MB  |   Closed    |   Closed    |    Open    |    Open    |
   |------+-------------+-------------+------------+------------|
   | 5MB  |    Open     |   Closed    |    Open    |   Closed   |
   |------+-------------+-------------+------------+------------|
   | 8MB  |    Open     |   Closed    |    Open    |    Open    |
   |------+-------------+-------------+------------+------------|
   | 16MB |   Closed    |    Open     |    Open    |    Open    |
   |------+-------------+-------------+------------+------------|
   | 20MB |    Open     |    Open     |   Closed   |    Open    |
   |------+-------------+-------------+------------+------------|
   | 32MB |    Open     |    Open     |    Open    |    Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |  Type   |           JP2            |          JP3          |
   |---------+--------------------------+-----------------------|
   | 80486SX |    pins 2 & 3 closed     |         Open          |
   |---------+--------------------------+-----------------------|
   | 80486DX |    pins 1 & 2 closed     |        Closed         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     BIOS CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Type   |          J7           |            J9            |
   |---------+-----------------------+--------------------------|
   |  27256  |         Open          |    pins 1 & 2 closed     |
   |---------+-----------------------+--------------------------|
   |  27512  |        Closed         |    pins 2 & 3 closed     |
   +------------------------------------------------------------+