Premium/386SX-16 Processor Board                    AST Part Number 202337-001

The 386SX-16 Processor Board is a 16 MHz 80386SX CPU/Memory adapter made
exclusively for the AST Premium/386SX-16 machine.  In its minimum
configuration, it comes with 1024K of RAM made up of one 32-bit 1MB module
(AST P/N 500718-001), and can be populated with a maximum of 4MBytes 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 16K of high speed ram-cache memory.  This board will support a
16MHz Intel 80387SX math co-processor.

Virtually all of the configuration on the 386SX-16 is achieved through
software routines.  There are no switch settings on the Processor Board, and
all jumpers are for test purposes.  They should remain in their default
positions at all times.  Memory can be installed one module at a time, with
bank 0 being the first to be populated, bank 1 being the second, etc.


JUMPER SETTINGS

    E1 - Leave installed at all times (Parity Checking)


BOARD LOCATIONS

    ͻ
      +-------------------+ BANK 3                                  
      |                   |                                        Ķ
      +-------------------+ BANK 2                       +------+   
      |   MEMORY  BANKS   |                              |387/SX|   
      +-------------------+ BANK 1                       |SOCKET|   
      |                   |                              +------+   
      +-------------------+ BANK 0                                  
                                                                    
                                                                    
             .. E1                                                 Ķ
    ͻ            ͻ            ͼ 
           ͼ                         ͼ      
                                                                      
