
JC INFORMATION SYSTEMS CORPORATION

MODEL 2020

Processor         80386DX
Processor Speed   25/33MHz
Chip Set          C & T PEAK/DM
Max. Onboard DRAM 32MB
Cache             64KB
BIOS              C & T/Phoenix
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card slot
NPU Options       80387

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  External battery             J4       Speaker                   SPK

  Power LED & keylock         KEYL      Self test                 TEST

  Reset switch                RSW       Turbo LED                 TLED

  32-bit external memory       S1       Turbo switch              TSW
  card

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not alter        W2              open

     Factory configured - do not alter        W3            pins 1 & 2
                                                              closed

     Factory configured - do not alter        W6             closed

     Factory configured - do not alter        W9            pins 2 & 3
                                                              closed

     CMOS memory normal operation             W10           pins 2 & 3
                                                              closed

      CMOS memory clear                        W10           pins 1 & 2
                                                              closed

     Monitor type select color                W11            closed

      Monitor type select monochrome           W11             open

  Note:The locations of W2, W3, W6, and W9 are unknown.

                            DRAM CONFIGURATION

       Size            Bank 0            Bank 1                W4

       1MB          (4) 256K x 9          NONE         pins 1 & 2 closed

       2MB          (4) 256K x 9      (4) 256K x 9     pins 1 & 2 closed

       4MB           (4) 1M x 9           NONE         pins 1 & 2 closed

       5MB           (4) 1M x 9       (4) 256K x 9     pins 2 & 3 closed

       8MB           (4) 1M x 9        (4) 1M x 9      pins 1 & 2 closed

       16MB          (4) 4M x 9           NONE         pins 1 & 2 closed

       32MB          (4) 4M x 9        (4) 4M x 9      pins 1 & 2 closed

                    CACHE CONFIGURATION

     Size       Cache CACHE      Location         TAG

     64KB        (8) 8K x 8       CACHE       (2) 16K x 1

