UNIDENTIFIED

286-12/16/20

Processor         80286
Processor Speed   12/16/20MHz
Chip Set          Acer
Max. Onboard DRAM 4MB
Cache             None
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J1       Reset switch                CN3

  Speaker                     CN1      Turbo switch                CN4

  Turbo LED                   CN2      Power LED & keylock         CN5

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

      Coprocessor synchronous with CPU         J2            pins 2 & 3
                                                              closed

      Coprocessor asynchronous with CPU        J2            pins 1 & 2
      (need extra OSC)                                        closed

  »   8 bit BIOS enabled                       J3             Closed

      16 bit BIOS enabled                      J3              Open

  »   Bus speed select AT clock                J4             Closed

      Bus speed select 1/2 CPU clock           J4              Open

  »   Parity check enabled                     J5              Open

      Parity check disabled                    J5             Closed

  »   CMOS memory normal operation             J7              Open

      CMOS memory clear                        J7             Closed

  »   Monitor type select monochrome           J8            pins 1 & 2
                                                              closed

      Monitor type select color                J8            pins 2 & 3
                                                              closed

  »   Internal battery enabled                 J9            pins 2 & 3
                                                              closed

      External battery enabled                 J9            pins 1 & 2
                                                              closed

  Note:The exact location of jumper J7 is unidentified by the
  manufacturer.

                            DRAM CONFIGURATION

     Size          Bank 0        Parity 0       Bank 1         Parity 1

     512KB       (4) 44256      (2) 41256        NONE            NONE

     640KB       (4) 44256      (2) 41256      (4) 4464        (2) 4164

     640KB      (2) 256K x 9    (2) 41256      (4) 4464        (2) 4164

    1024KB       (4) 44256      (2) 41256      (4) 44256       (2) 4164

    1024KB      (2) 256K x 9       NONE       (2) 256K x 9       NONE

    2048KB       (2) 1M x 9        NONE          NONE            NONE

    4096KB       (2) 1M x 9        NONE       (2) 1M x 9         NONE