J-MARK COMPUTER CORPORATION

JET-486 CACHE 486-33/486SX-25

Processor         80486SX/80486DX
Processor Speed   25/33MHz
Chip Set          ETEQ
Max. Onboard DRAM 32MB
Cache             64/256KB
BIOS              AMI
Dimensions        330mm x 220mm
I/O Options       32-bit external memory card slot
NPU Options       80487SX/4167

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  External battery           J1        Power LED & keylock         J5

  Reset switch               J2        Speaker                     J6

  Turbo switch               J3        32-bit external             S1
                                       memory card

  Turbo LED                  J4

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

  »   Factory configured - do not alter        JP1              N/A

  »   Monitor type select monochrome           JP2             Open

      Monitor type select color                JP2            Closed

  »   CMOS memory normal operation             JP3            Closed

      CMOS memory clear                        JP3             Open

  »   Factory configured - do not alter        JP4              N/A

  »   Factory configured - do not alter        JP11             N/A

  »   Factory configured - do not alter        JP12             N/A

  »   Factory configured - do not alter        JP13             N/A

  »   Factory configured - do not alter        JP14             N/A

  »   Factory configured - do not alter        JP21             N/A

  »   Factory configured - do not alter        JP23             N/A

  »   Factory configured - do not alter        JP24             N/A

              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

                    CACHE CONFIGURATION

     Size          Bank 0       TAG (U22)      TAG (U23)

     64KB        (8) 8K x 8    (1) 16K x 4       NONE

     256KB      (8) 32K x 8    (1) 16K x 4    (1) 16K x 4

                   CACHE JUMPER CONFIGURATION

   Size        JP5        JP6        JP7        JP8       JP22

   64KB       Open       Open       2 & 3      2 & 3      Open

   256KB     Closed     Closed      1 & 2      1 & 2     Closed

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      Type            JP9           JP10           JP15          JP16

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

    80486SX +      pins 1 & 2      Closed       pins 1 & 2       Open
     80487SX         closed                       closed

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

                         NPU JUMPER CONFIGURATION

      Type           JP17          JP18           JP19           JP20

    80487SX          Open          Open           Open           Open

      4167          Closed        Closed         Closed         Closed

  Note: In order to use the Weitek 4167, a daughter board must be
  installed in the CPU socket. You would then insert the NPU and CPU into
  the daughter board.