
FOREX COMPUTER COMPANY

386 CACHE SYSTEM BOARD

Processor         80386DX/AM386DX
Processor Speed   33/40MHz
Chip Set          Forex
Max. Onboard DRAM 64MB
Cache             32/64/128KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       external memory card slot
NPU Options       80387/3167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            JP2      Speaker                    JP10

  Turbo LED                   JP7      Turbo switch               JP11

  Reset switch                JP8      External memory card        S1

  Power LED & keylock         JP9

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                JP3             Open

      Monitor type select monochrome           JP3            Closed

     NPU mode select synchronous with         JP5           pins 1 & 2
      CPU                                                     closed

      NPU mode select synchronous with         JP5           pins 2 & 3
      oscillator installed at Y1                              closed

     External battery select 6.0VDC          JP200            Open

      External battery select 3.6VDC          JP200           Closed

     Factory configured - do not alter       JP201             N/A

     CMOS memory normal operation            JP202            Open

      CMOS memory clear                       JP202           Closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9       NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9       NONE           NONE

     4MB         (4) 1M x 9        NONE           NONE           NONE

     5MB        (4) 256K x 9    (4) 1M x 9        NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9    (4) 1M x 9        NONE

     8MB         (4) 1M x 9     (4) 1M x 9        NONE           NONE

     9MB        (4) 256K x 9    (4) 1M x 9     (4) 1M x 9        NONE

     12MB        (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     16MB        (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB        (4) 4M x 9        NONE           NONE           NONE

     20MB        (4) 1M x 9     (4) 4M x 9        NONE           NONE

     24MB        (4) 1M x 9     (4) 1M x 9     (4) 4M x 9        NONE

     32MB        (4) 4M x 9     (4) 4M x 9        NONE           NONE

     36MB        (4) 1M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     48MB        (4) 4M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     64MB        (4) 4M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

  Note:Banks 2 & 3 are used when a 32-bit external memory card is
  installed.

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1         Tag1           Tag0

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

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8     (1) 8K x 8

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

        CACHE JUMPER CONFIGURATION

        Size                 JP6

        32KB          pins 1 & 2 closed

        64KB          pins 2 & 3 closed

        128KB         pins 2 & 3 closed

