Premium Workstation/386SX Motherboard               AST Part Number 202276-001

The Workstation/386SX is a low-profile, highly integrated IBM compatible based
on the Intel 386SX microprocessor.  Because of its low-profile design, the
user is limited to two 16-bit expansion slots (horizontal mount), and most
standard features are available directly on the motherboard.

The Workstation 386/SX is a two-speed system, running at either 8 or 16MHz.
The system board comes standard with 1MB of memory, and is expandable to 6MB
on the motherboard.  The system comes standard with one parallel port and two
serial ports.  Options would include EGA and VGA video modules that do not
require a BUS slot, and support for the 80387/SX (8 or 16MHz).


MEMORY

    This motherboard supports from 512K to 6144K of RAM using 100NS 256K or
    1024K SIMM Modules.  There are three banks on the board for RAM, and each
    bank accepts two SIMMS.  A bank may NOT be partially populated (one SIMM).
    If both 256K and 1024K SIMMs are used, the 1024K Modules must be installed
    in the lower numbered banks.  Once the RAM is installed, the system will
    recognize its presence at boot.  No switches or jumpers need to be set.

    Below is a matrix of valid memory configurations:

    BANK 0  BANK 1  BANK 2   TOTAL MEMORY
    ------  ------  ------  --------------
     512K     -       -      512K (0.5 MB)
     512K    512K     -     1024K (1.0 MB)
     512K    512K    512K   1536K (1.5 MB)
    2048K     -       -     2048K (2.0 MB)
    2048K    512K     -     2560K (2.5 MB)
    2048K    512K    512K   3072K (3.0 MB)
    2048K   2048K     -     4096K (4.0 MB)
    2048K   2048K    512K   4608K (4.5 MB)
    2048K   2048K   2048K   6144K (6.0 MB)

    NOTE:  512K = TWO 256K SIMMs
          2048K = TWO 1024K SIMMs


CONNECTORS

    J1 - Control Panel (LEDs; Reset)
    J2 - AT-Imbedded Hard Drive
    J3 - Floppy Drive
    J4 - Power Supply
    J5 - External Floppy/Tape Option
    J6 - Battery
    J9 - Video Module Option


SWITCH SETTINGS

    SW1-1
        ON  - Color Video Adapter
        OFF - Mono Video Adapter

    SW1-2
        ON  - Disables Password Protection
        OFF - Allows Password Protection






JUMPER SETTINGS

    E1 - Factory Test - Leave Open
    E2 - Factory Test - Leave Open


SWITCH, JUMPER, CONNECTOR, AND MEMORY BANK LOCATIONS

    ͻ
                                                       
                          B                           
                          U *                               POWER
                          S *                               SUPPLY
                            * J9                      
                          P *                         
                          O *                         
                          S                           
                          T         J5 *********       
                                    J4 ********   J6 *
                                    J3 ********       
                                                      ͻ
     +---------------+                                     * 
     | MEMORY BANK 2 |                                  J2 * 
     +---------------+ E1 E2                               * 
     | MEMORY BANK 1 | *  *                                  
     +---------------+                                       
     | MEMORY BANK 0 |  ---                                  
     +---------------+ |SW1|                 J1 *            
                        ---                                  
    ͼ
