Premium/386-16 Processor Board                      AST Part Number 202323-001

The 386-16 Processor Board is a 16 MHz 80386 Processor board made exclusively for
the AST Premium/386-16 machine.  In its minimum configuration, it comes with
1024K of RAM made up of 100NS SIMM modules, and can be populated with a
maximum of 8 MegaBytes of memory.  The first Megabyte is split into 640K of
conventional memory and 384K of "Shadow Ram" reserved for system use.  All
subsequent memory would be addressed as Linear Extended memory, and may be
used as Expanded EMS by utilizing the included ASTEMM.SYS memory manager.  The
Processor Board also comes with 64K of high speed ram-cache memory.  This board will
support a 16MHz 80387 math co-processor.


SWITCH SETTINGS

Switch Block One has four positions and sets the amount of RAM installed on
the 386-16 Processor Board:

    SW1  SW2  SW3  MEMORY INSTALLED
    ---  ---  ---  ----------------
    OFF  OFF  OFF    1024K (1MB)
     ON  OFF  OFF    2048K (2MB)
    OFF   ON  OFF    4096K (4MB)
     ON  OFF   ON    5120K (5MB)
     ON   ON   ON    8192K (8MB)

    NOTE - SW4 REMAINS OFF TO ENABLE PARITY CHECKING


JUMPER SETTINGS

    E1 - Leave installed at all times
    E2 - Leave open at all times


MEMORY INSTALLATION

Banks 0 and 1 each hold four SIMM modules, and may not be partially
populated.  You may use either 256K or 1024K modules (100NS), and valid
configurations are below:

      SIMM       SIMM
     BANK 0     BANK 1    TOTAL MEMORY
    ---------  ---------  ------------
     256K (4)   NONE         1024K
     256K (4)   256K (4)     2048K
    1024K (4)   NONE         4096K
     256K (4)  1024K (4)     5120K
    1024K (4)  1024K (4)     8192K

















SWITCH AND JUMPER LOCATIONS

    ͻ
               +------+     +-----------------+-----------------+   
        +----+ |      |     |                 |                 |  Ķ
        |    | |      |     +----- Bank 1 ----+----- Bank 2 ----+   
        +----+ +------+ :   |                 |                 |   
        80387   80386   E1  +-----------------+-----------------+   
                             :       +------+                       
                             E2      |######|<-- SW-1               
                                     +------+                       
                                                                    
                                                                    
    ͻ            ͻ        ͻ            ͻ  Ķ
           ͼ              ͼ ͼ Ľ 
                                                                      
