ABC COMPUTER COMPANY, LTD.

A4865

Processor         80486DX
Processor Speed   33MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/128/256/512KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card slot
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery            J10       Turbo LED                 JP12

  Power LED & Keylock         J23       Reset switch               SW1

  Speaker                     J24       Turbo switch               SW2

                        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

  »   Normal operation - do not alter         JP205            Open

      Factory test (system burn in)           JP205           Closed

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

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

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

     12MB        (4) 1M x 9    (4) 1M x 9     (4) 1M x 9        NONE

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

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

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

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

     28MB        (4) 1M x 9    (4) 1M x 9     (4) 4M x 9     (4) 1M x 9

     32MB        (4) 4M x 9    (4) 4M x 9        NONE           NONE

     36MB        (4) 1M x 9    (4) 4M x 9     (4) 4M x 9        NONE

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

     48MB        (4) 4M x 9    (4) 4M x 9     (4) 4M x 9        NONE

     52MB        (4) 1M x 9    (4) 4M 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 utilized when a 32-bit external memory card is
  installed.

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1          Tag         Dirty Bit

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

     128KB       (8) 8K x 8     (8) 8K x 8    (1) 8K x 8     (1) 64K x 1

     256KB      (8) 32K x 8        NONE       (1) 32K x 8    (1) 64K x 1

     512KB      (8) 32K x 8    (8) 32K x 8    (1) 32K x 8    (1) 64K x 1

                        CACHE JUMPER CONFIGURATION

   Size         JP8         JP9         JP10        JP11         JP206

   64KB        open         open        open        open       pins 2 & 3
                                                                closed

   128KB      closed        open        open       closed      pins 2 & 3
                                                                closed

   256KB      closed       closed       open       closed      pins 2 & 3
                                                                closed

   512KB      closed       closed      closed      closed      pins 1 & 2
                                                                closed