J-MARK COMPUTER CORPORATION

JET-486DX/SX 20/25 NON-CACHE

Processor         80486SX/80486DX
Processor Speed   20/25/33MHz
Chip Set          ETEQ
Max. Onboard DRAM 32MB
Cache             None
BIOS              AMI
Dimensions        220mm x 220mm
I/O Options       None
NPU Options       80487SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Reset switch                J1       Turbo switch                J4

  Power LED & keylock         J2       External battery            JP1

  Speaker                     J3       Turbo LED                   JP5

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color                JP2            Closed

      Monitor type select monochrome           JP2             Open

  »   CMOS memory normal operation             JP3            Closed

      CMOS memory clear                        JP3             Open

  »   Factory configured - do not alter       JP12            Closed

  »   Oscillator speed select 25MHz           JP13           pins 1 & 2
                                                              closed

      Oscillator speed select 20MHz           JP13           pins 2 & 3
                                                              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) 1 M x 9

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

      16MB        (4) 4M x 9         NONE

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

                          CPU TYPE CONFIGURATION

     Type           JP8            JP9           JP10           JP11

    80486SX         Open          Open        pins 1 & 2      pins 1 & 2
                                                closed         closed

    80487SX        Closed         Open           Open         pins 2 & 3
                                                               closed

    80486DX        Closed        Closed       pins 2 & 3      pins 1 & 2
                                                closed         closed

                        CHIPSET TYPE CONFIGURATION

     Type           JP6            JP7           JP14            JP15

    82C493       pins 1 & 2     pins 2 & 3     pins 2 & 3     pins 1 & 2
                  closed         closed         closed          closed

    82C492       pins 2 & 3     pins 1 & 2     pins 1 & 2     pins 2 & 3
                  closed         closed         closed          closed