
MICRO EXPRESS, INC.

FOREX 386/486 (REV. B2/B3)

Processor        80386DX/80486SX/80487SX/80486DX /80486DX2
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         FOREX
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      None
NPU Options      80387DX/3167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery            JP2       Speaker                   JP10

  Reset switch                JP8       Turbo switch              JP15

  Power LED & keylock         JP9       Turbo LED                 JP16

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not              2E              N/A
      alter

     Factory configured - do not             JP5              N/A
      alter

     CMOS memory normal operation            JP6              Open

      CMOS memory clear                       JP6             Closed

  Note: The location of JP5 is unidentified.

              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 0          TAG 1

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8        NONE

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

     256KB      (4) 32K x 8    (4) 32K x 8       NONE        (1) 32K x 8

                 CACHE JUMPER CONFIGURATION

   Size      JP8A      JP8B       JP8C      JP8E      JP8F

   64KB      2 & 3     1 & 2     1 & 2     2 & 3     1 & 2

  128KB      1 & 2     2 & 3     2 & 3     1 & 2     1 & 2

  256KB      2 & 3     1 & 2     1 & 2     1 & 2     2 & 3

  Note: Pins desingated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type               JP12              JP13               JP30

      80486SX          pins 2 & 3         pins 2 & 3        pins 2 & 3
                         closed            closed             closed

      80487SX          pins 1 & 2         pins 1 & 2        pins 2 & 3
                         closed            closed             closed

      80486DX          pins 1 & 2         pins 1 & 2        pins 1 & 2
                         closed            closed             closed

     80486DX2          pins 1 & 2         pins 1 & 2        pins 1 & 2
                         closed            closed             closed

                          CPU TYPE CONFIGURATION

    Type       1A       1C       1D      1E       1F       1G       2A

   80386      2 & 3   2 & 3    2 & 3    2 & 3    2 & 3   2 & 3     2 & 3

   80486      1 & 2   1 & 2    1 & 2    1 & 2    1 & 2   1 & 2     1 & 2

  Note: Pins designated should be in the closed position. The location of
  W1X & W2X are unidentified.

                      CPU TYPE CONFIGURATION (CONT)

    Type       2C      2D      2G       2H      W1B      W1X       W2X

   80386      2 & 3   2 & 3   2 & 3    2 & 3   2 & 3    2 & 3     2 & 3

   80486      1 & 2   1 & 2   1 & 2    1 & 2   1 & 2    1 & 2     1 & 2

  Note: Pins designated should be in the closed position. The location of
  W1X & W2X are unidentified.

                       CPU CLOCK SPEED CONFIGURATION

    Speed          JP7A           JP7B           JP7C            JP7D

    20MHz        pins 2 & 3     pins 1 & 2     pins 1 & 2     pins 2 & 3
                  closed         closed         closed          closed

    25MHz        pins 1 & 2     pins 2 & 3     pins 1 & 2     pins 2 & 3
                  closed         closed         closed          closed

    33MHz        pins 1 & 2     pins 1 & 2     pins 2 & 3     pins 2 & 3
                  closed         closed         closed          closed

    40MHz        pins 2 & 3     pins 2 & 3     pins 1 & 2     pins 2 & 3
                  closed         closed         closed          closed

    50iMHz       pins 1 & 2     pins 2 & 3     pins 1 & 2     pins 2 & 3
                  closed         closed         closed          closed

    50MHz        pins 2 & 3     pins 1 & 2     pins 2 & 3     pins 2 & 3
                  closed         closed         closed          closed

    66iMHz       pins 1 & 2     pins 1 & 2     pins 2 & 3     pins 1 & 2
                  closed         closed         closed          closed

    80MHz        pins 2 & 3     pins 2 & 3     pins 1 & 2     pins 1 & 2
                  closed         closed         closed          closed

