MICRO EXPRESS, INC.

FOREX 486/50

Processor           80486SX/80487SX/80486DX/80486DX2
Processor Speed     25/33/50(internal)/50/66(internal)MHz
Chip Set            FOREX
Max. Onboard DRAM   32MB
Cache               64/128/256KB
BIOS                AMI
Dimensions          254mm x 218mm
I/O Options         32-bit local bus card slot
NPU Options         4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J2       Turbo switch               J15

  Reset switch                 J8       Turbo LED                  J16

  Power LED & keylock          J9       32-bit local bus card      S1

  Speaker                     J10

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

  »   CMOS memory normal operation             JP6             Open

      CMOS memory clear                        JP6            Closed

  »   Local bus speed select < 33MHz           JP20            Open

      Local bus speed select ³ 33MHz           JP20           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 (U1)       TAG (U2)

     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    (1) 8K x 8     (1) 8K x 8

                 SRAM JUMPER CONFIGURATION

   Size      JP8A      JP8B       JP8D      JP8E      JP8F

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

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

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

  Note: Pins designated 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