AUSTIN COMPUTER SYSTEMS
=======================

   486/SLC 25

   Processor             80386SX/CX486SLC                         
   Processor Speed       25MHz                                    
   Chip Set              C & T                                    
   Max. Onboard DRAM     16MB                                     
   Cache                 None                                     
   BIOS                  AMI                                      
   Dimensions            220mm x 220mm                            
   I/O Options           16-bit external cache memory card slot   
   NPU Options           80387SX                                  

<gopher://bitreich.org/I/th99/m/A-B/30948-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | Speaker       |    J1    | External battery     |   J13    |
   |---------------+----------+----------------------+----------|
   | Turbo switch  |    J7    | Reset switch         |   J14    |
   |---------------+----------+----------------------+----------|
   | Turbo LED     |    J8    | 16-bit external      |    S1    |
   |               |          | cache memory card    |          |
   |---------------+----------+----------------------+----------|
   | Power LED &   |   J10    |                      |          |
   | keylock       |          |                      |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | CPU speed select forced high   |   J7   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Monitor type select color      |  J12   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select monochrome |  J12   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |  J15   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |  J15   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Cache card absent              |   W1   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Cache card present             |   W1   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 1MB  | (2) 256K x  | (2) 256K x  |    NONE    |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (2) 256K x  | (2) 256K x  | (2) 256K x | (2) 256K x |
   |      |      9      |      9      |     9      |     9      |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (2) 1M x 9  |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 3MB  | (2) 256K x  | (2) 256K x  | (2) 1M x 9 |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (2) 1M x 9  | (2) 1M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 5MB  | (2) 256K x  | (2) 256K x  | (2) 1M x 9 | (2) 1M x 9 |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (2) 1M x 9  | (2) 1M x 9  | (2) 1M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (2) 1M x 9  | (2) 1M x 9  | (2) 1M x 9 | (2) 1M x 9 |
   |------+-------------+-------------+------------+------------|
   | 9MB  | (2) 256K x  | (2) 256K x  | (2) 4M x 9 |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 10MB | (2) 1M x 9  | (2) 4M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 12MB | (2) 1M x 9  | (2) 1M x 9  | (2) 4M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 16MB | (2) 4M x 9  | (2) 4M x 9  |    NONE    |    NONE    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |         CACHE JUMPER CONFIGURATION FOR CACHE CARD          |
   |------------------------------------------------------------|
   |        Size        |  J2   |  J3   |  J4   |  J5   |  J6   |
   |--------------------+-------+-------+-------+-------+-------|
   |   64KB/2-Way Set   | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
   |    Associative     |       |       |       |       |       |
   |--------------------+-------+-------+-------+-------+-------|
   |   64KB/Directly    | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
   |       Mapped       |       |       |       |       |       |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+