ABC COMPUTER COMPANY, LTD.

A4870 VER. 2.0

Processor         80486DX
Processor Speed   33MHz
Chip Set          UMC
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330.2mm x 218.4mm
I/O Options       32-bit external memory card slot
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  External battery           J1        Speaker                    J10

  Turbo switch               J7        Power LED & keylock        J11

  Turbo LED                  J8        32-bit external             S1
                                       memory card

  Reset switch               J9

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             J4            pins 1 & 2
                                                              closed

      CMOS memory clear                        J4            pins 2 & 3
                                                              closed

  »   Monitor type select color                J5             Closed

      Monitor type select monochrome           J5              Open

                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

  17MB      (4) 256K x 9          (4) 4M x 9

  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

  64KB     (4) 8K x 8      (4) 8K x 8       (4) 4K x 4

  128KB    (4) 32K x 8        NONE         (4) 16K x 4

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

                        CACHE JUMPER CONFIGURATION

  Size       W3         W4          W5         W6         W7        W8

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

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

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

  Note:Pins designated should be in closed position.