ABC COMPUTER COMPANY, LTD.

A4872

Processor         80486DX
Processor Speed   33MHz
Chip Set          UMC
Max. Onboard DRAM 32MB
Cache             256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J1       Reset switch                J9

  Turbo LED                   J7       Speaker                     J10

  Turbo switch                J8       Power LED & keylock         J11

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color                J4             Closed

      Monitor type select monochrome           J4              Open

  »   Factory configured - do not alter        J5              Open

  »   CMOS memory normal operation             J6            pins 1 & 2
                                                              closed

      CMOS memory clear                        J6            pins 2 & 3
                                                              closed

  »   Factory configured - do not alter        W1            pins 1 & 2
                                                              closed

  »   Factory configured - do not alter        W2            pins 1 & 2
                                                              closed

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

  »   Factory configured - do not alter        W4            pins 1 & 2
                                                              closed

  »   Factory configured - do not alter        W5            pins 2 & 3
                                                              closed

  »   Factory configured - do not alter        W10             Open

  »   Factory configured - do not alter        W11             Open

  »   Factory configured - do not alter        W15             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) 1 M 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

     64KB        (4) 8K x 8     (4) 8K x 8    (4) 16K 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           W6              W7             W8             W9

    64KB        pins 1 & 2     pins 1 & 2        Open         pins 1 & 2
                 closed          closed                        closed

    128KB       pins 1 & 2     pins 2 & 3     pins 1 & 2      pins 2 & 3
                 closed          closed         closed         closed

    256KB       pins 2 & 3     pins 2 & 3     pins 2 & 3      pins 1 & 2
                 closed          closed         closed         closed

                          CPU TYPE CONFIGURATION

       Type               W12               W13                W14

      80486SX            Open            pins 2 & 3           Open
                                          closed

      80487SX           Closed           pins 1 & 2         pins 2 & 3
                                          closed             closed

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