
ABC COMPUTER COMPANY, LTD.

A3875

Processor         80386DX
Processor Speed   25/33/40MHz
Chip Set          Forex
Max. Onboard DRAM 32MB
Cache             32/64/128KB
BIOS              AMI
Dimensions        332mm x 218mm
I/O Options       None
NPU Options       80387/3167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J3       Turbo switch                J10

  Reset switch                J8       Speaker                     J11

  Turbo LED                   J9       Power LED & keylock         J12

                        USER CONFIGURABLE SETTINGS

                 Function                     Jumper         Position

     Monitor type select color                 J1            Closed

      Monitor type select monochrome            J1             Open

     External battery select 3.6VDC            J4            Closed

      External battery select 6VDC              J4             Open

     CMOS memory normal operation              J5             Open

      CMOS memory clear                         J5            Closed

     NPU mode select synchronous with          J6           pins 1 & 2
      CPU                                                     closed

      NPU mode select asynchronous with         J6           pins 2 & 3
      CPU                                                     closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U41)      TAG (U42)

     32KB        (4) 8K x 8        NONE       (1) 8K x 8        NONE

     64KB        (4) 8K x 8     (4) 8K x 8    (2) 8K x 8     (2) 8K x 8

     128KB      (4) 32K x 8        NONE       (1) 32K x 8       NONE

  Note: Bank 0 = U44, U46, U48 & U50

        CACHE JUMPER CONFIGURATION

        Size                  J7

        32KB          pins 1 & 2 closed

        64KB          pins 2 & 3 closed

        128KB         pins 2 & 3 closed

