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