ABC COMPUTER COMPANY, LTD.

A3866

Processor         80386DX
Processor Speed   33/40MHz
Chip Set          OPTI
Max. Onboard DRAM 20MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card slot
NPU Options       80387/3167

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  External battery           J10       32-bit external             S1
                                       memory card

  Power LED & keylock        J23       Reset switch               SW1

  Speaker                    J24       Turbo switch               SW2

  Turbo LED                  JP4

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color                JP1            Closed

      Monitor type select monochrome           JP1             Open

  »   CMOS memory normal operation             JP2           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP2           pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

     Size         Bank 0          Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9       NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9       NONE           NONE

     4MB        (4) 1M x 9         NONE           NONE           NONE

     5MB        (4) 256K x 9   (4) 1 M x 9        NONE           NONE

     6MB        (4) 256K x 9    (4) 1M x 9        NONE           NONE

     8MB        (4) 1M x 9      (4) 1M x 9        NONE           NONE

     10MB       (4) 256K x 9   (4) 256K x 9    (4) 1M x 9     (4) 1M x 9

     16MB       (4) 1M x 9      (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB       (4) 4M x 9         NONE           NONE           NONE

     17MB       (4) 4M x 9     (4) 256K x 9       NONE           NONE

     20MB       (4) 4M x 9      (4) 1M x 9        NONE           NONE

     24MB       (4) 1M x 9      (4) 1M x 9     (4) 4M x 9        NONE

     40MB       (4) 1M x 9      (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     64MB       (4) 4M x 9      (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

  Note:Banks 2 & 3 are used when a 32-bit external memory card is
  installed.

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          Tag

     64KB        (4) 8K x 8     (4) 8K x 8    (3) 16K x 4

     128KB      (4) 32K x 8        NONE       (3) 16K x 4

     256KB      (4) 32K x 8    (4) 32K x 8    (3) 16K x 4

                 CACHE JUMPER CONFIGURATION

   Size       JP5       JP6       JP7       JP8       JP9

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

  128KB      2 & 3     1 & 2     2 & 3     Closed    2 & 3

  256KB      2 & 3     2 & 3     2 & 3     Closed    1 & 2

  Note: Pins designated should be in the closed position.