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

   PREMIUM II 386SX/20 (MH ver. 2)

   MODELS 202373-001 & 202373-002

   Processor       80386SX (on external CPU/Memory module)        
   Processor Speed 20MHz                                          
   Chip Set        AST                                            
   Max. Onboard    None (16MB on external CPU/Memory module)      
   DRAM            
   SRAM Cache      None (16KB on external CPU/Memory module)      
   BIOS            AST                                            
   Dimensions      344mm x 250mm                                  
   I/O Options     16-bit external CPU/Memory module slot, 16-bit 
                   external Memory module slot (2), bus mouse     
                   port, floppy drive interface, IDE interface,   
                   parallel port, serial port (2), SVGA port      
   NPU Options     80387SX (on external CPU/Memory module)        

<gopher://bitreich.org/I/th99/m/A-B/31186-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose            | Location | Purpose         | Location |
   |--------------------+----------+-----------------+----------|
   | SVGA port          |   CN1    | Front panel     |    P5    |
   |                    |          | switches & LEDs |          |
   |--------------------+----------+-----------------+----------|
   | Bus mouse port     |   CN2    | Speaker         |    P6    |
   |--------------------+----------+-----------------+----------|
   | Serial port 1      |   CN3    | External        |    P8    |
   | (COM1)             |          | battery         |          |
   |--------------------+----------+-----------------+----------|
   | Parallel port      |   CN4    | IDE interface   |   P11    |
   |--------------------+----------+-----------------+----------|
   | Serial port 2      |   J15    | Fan power       |   P101   |
   | (COM2)             |          |                 |          |
   |--------------------+----------+-----------------+----------|
   | VGA pass-through   |   J18    | 16-bit external |    S1    |
   |                    |          | CPU/Memory      |          |
   |                    |          | module          |          |
   |--------------------+----------+-----------------+----------|
   | Floppy drive       |    P3    | 16-bit external |    S2    |
   | interface          |          | Memory module   |          |
   |                    |          | slot            |          |
   |--------------------+----------+-----------------+----------|
   | Third floppy drive |    P4    | 16-bit external |    S3    |
   | interface          |          | Memory module   |          |
   |                    |          | slot            |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               |  Switch  | Position |
   |                                      |   SW1    |          |
   |--------------------------------------+----------+----------|
   |>> | VGA port enabled                 | switch 1 |  closed  |
   |---+----------------------------------+----------+----------|
   |   | VGA port disabled                | switch 1 |   open   |
   |---+----------------------------------+----------+----------|
   |>> | Password check enabled           | switch 2 |   open   |
   |---+----------------------------------+----------+----------|
   |   | Password check disabled          | switch 2 |  closed  |
   |---+----------------------------------+----------+----------|
   |>> | Factory configured - do not      | switch 3 |   open   |
   |   | alter                            |          |          |
   |---+----------------------------------+----------+----------|
   |>> | Factory configured - do not      | switch 4 |   open   |
   |   | alter                            |          |          |
   |---+----------------------------------+----------+----------|
   |>> | Factory configured - do not      | switch 5 |  closed  |
   |   | alter                            |          |          |
   |---+----------------------------------+----------+----------|
   |>> | Factory configured - do not      | switch 6 |  closed  |
   |   | alter                            |          |          |
   |---+----------------------------------+----------+----------|
   |>> | Monitor type select PS/2 style   | switch 7 |  closed  |
   |---+----------------------------------+----------+----------|
   |   | Monitor type select AT style     | switch 7 |   open   |
   |---+----------------------------------+----------+----------|
   |>> | Monitor type select VGA or       | switch 8 |   open   |
   |   | fixed-frequency                  |          |          |
   |---+----------------------------------+----------+----------|
   |   | Monitor type select              | switch 8 |  closed  |
   |   | multi-frequency                  |          |          |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/A-B/31186-2.png>
   

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              |  Jumper  |  Position  |
   |------------------------------------+----------+------------|
   |>>     | Parity check enabled       |    E1    |   closed   |
   |-------+----------------------------+----------+------------|
   |       | Parity check disabled      |    E1    |    open    |
   |------------------------------------------------------------|
   | Note:AST CPU/Memory module part number is 202438-001 or    |
   | 202438-002.                                                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Size  |   Bank 0    |   Bank 1   |   Bank 2   |  Bank 3   |
   |--------+-------------+------------+------------+-----------|
   |  1MB   | (1) 1M x 9  |    NONE    |    NONE    |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  2MB   | (1) 1M x 9  | (1) 1M x 9 |    NONE    |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  3MB   | (1) 1M x 9  | (1) 1M x 9 | (1) 1M x 9 |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  4MB   | (1) 1M x 9  | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x  |
   |        |             |            |            |     9     |
   |--------+-------------+------------+------------+-----------|
   |  4MB   | (1) 4M x 9  |    NONE    |    NONE    |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  5MB   | (1) 1M x 9  | (1) 4M x 9 |    NONE    |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  6MB   | (1) 1M x 9  | (1) 1M x 9 | (1) 4M x 9 |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  7MB   | (1) 1M x 9  | (1) 1M x 9 | (1) 1M x 9 | (1) 4M x  |
   |        |             |            |            |     9     |
   |--------+-------------+------------+------------+-----------|
   |  8MB   | (1) 4M x 9  | (1) 4M x 9 |    NONE    |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  9MB   | (1) 1M x 9  | (1) 4M x 9 | (1) 4M x 9 |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  10MB  | (1) 1M x 9  | (1) 1M x 9 | (1) 4M x 9 | (1) 4M x  |
   |        |             |            |            |     9     |
   |--------+-------------+------------+------------+-----------|
   |  12MB  | (1) 4M x 9  | (1) 4M x 9 | (1) 4M x 9 |   NONE    |
   |--------+-------------+------------+------------+-----------|
   |  13MB  | (1) 1M x 9  | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x  |
   |        |             |            |            |     9     |
   |--------+-------------+------------+------------+-----------|
   |  16MB  | (1) 4M x 9  | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x  |
   |        |             |            |            |     9     |
   |------------------------------------------------------------|
   | Notes: 16KB of SRAM Cache is on the CPU/Memory module.     |
   |                                                            |
   | 128KB of DRAM are 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.         |
   +------------------------------------------------------------+