AST RESEARCH, INC.
==================

   POWER PREMIUM 486SX/25 (MODEL 202441-001)

   Processor         80486SX/80487SX (on external CPU/Memory      
                     module)                                      
   Processor Speed   25MHz                                        
   Chip Set          AST                                          
   Max. Onboard DRAM None (16MB on external CPU/Memory module)    
   Cache             None                                         
   BIOS              AST                                          
   Dimensions        344mm x 250mm                                
   I/O Options       32-bit external CPU/Memory module slot       
                                                                  
                     32-bit external Memory module slot (2)       
                                                                  
                     bus mouse port, floppy drive interface       
                                                                  
                     IDE interface, parallel port, serial port    
                     (2), SVGA port                               
   NPU Options       4167 (on external CPU/Memory module)         

<gopher://bitreich.org/I/th99/m/A-B/31230-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | SVGA port         |   CN1    | Third floppy     |   J25    |
   |                   |          | drive interface  |          |
   |-------------------+----------+------------------+----------|
   | Bus mouse port    |   CN2    | External battery |   J26    |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |   CN3    | Speaker          |   J27    |
   | (COM1)            |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Serial port 2     |   CN4    | Fan power        |   J28    |
   | (COM2)            |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Parallel port     |   J13    | Front panel      |   J29    |
   |                   |          | switches & LEDs  |          |
   |-------------------+----------+------------------+----------|
   | VGA pass-through  |   J19    | IDE interface    |   J40    |
   |                   |          | LED              |          |
   |-------------------+----------+------------------+----------|
   | IDE interface     |   J22    | 32-bit external  |    S1    |
   |                   |          | CPU/Memory       |          |
   |                   |          | module           |          |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |   J24    | 32-bit external  | S2 & S3  |
   | interface         |          | Memory module    |          |
   |                   |          | slots            |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |           Function            | Jumper/Switch |  Position  |
   |-------------------------------+---------------+------------|
   |>> | CMOS memory normal        | SW1/switch 1  |    open    |
   |   | operation                 |               |            |
   |---+---------------------------+---------------+------------|
   |   | CMOS memory clear         | SW1/switch 1  |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Password check enabled    | SW1/switch 2  |    open    |
   |---+---------------------------+---------------+------------|
   |   | Password check disabled   | SW1/switch 2  |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Flash BIOS write disabled | SW1/switch 3  |    open    |
   |---+---------------------------+---------------+------------|
   |   | Flash BIOS write enabled  | SW1/switch 3  |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | VGA port enabled          | SW1/switch 4  |   closed   |
   |---+---------------------------+---------------+------------|
   |   | VGA port disabled         | SW1/switch 4  |    open    |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E1       |   closed   |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E2       | pins 1 & 2 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E3       |   closed   |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E4       |    open    |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      E5       |    open    |
   |   | not alter                 |               |            |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/A-B/31230-2.png>
   

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Function                | Jumper | Position |
   |----------------------------------------+--------+----------|
   |>> | Parity check enabled               |   E1   |  closed  |
   |---+------------------------------------+--------+----------|
   |   | Parity check disabled              |   E1   |   open   |
   |---+------------------------------------+--------+----------|
   |>> | Factory configured - do not alter  |   E2   |  closed  |
   |------------------------------------------------------------|
   | Note:AST CPU/Memory module part number is 202439-002.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |     Size      |        Bank 0        |       Bank 1        |
   |---------------+----------------------+---------------------|
   |      2MB      |      (2) 1M x 9      |        NONE         |
   |---------------+----------------------+---------------------|
   |      4MB      |      (2) 1M x 9      |     (2) 1M x 9      |
   |---------------+----------------------+---------------------|
   |      8MB      |      (2) 4M x 9      |        NONE         |
   |---------------+----------------------+---------------------|
   |     10MB      |      (2) 1M x 9      |     (2) 4M x 9      |
   |---------------+----------------------+---------------------|
   |     16MB      |      (2) 4M x 9      |     (2) 4M x 9      |
   |------------------------------------------------------------|
   | Notes:128KB of DRAM is reserved for System and VGA BIOS    |
   | shadowing and cannot be disabled.                          |
   |                                                            |
   | Up to two of the following memory boards may be installed  |
   | in addition to the CPU/Memory                              |
   |                                                            |
   | module: AST part numbers 202275-004, 202275-006,           |
   | 202387-001, or 202387-005.                                 |
   +------------------------------------------------------------+