ARNOS INSTRUMENTS & COMPUTER SYSTEMS COMPANY, INC.

486-25C/33C

Processor         80486DX
Processor Speed   25/33MHz
Chip Set          None
Max. Onboard DRAM 32MB
Cache             128KB
BIOS              Phoenix
Dimensions        355mm x 304mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            X4       Status display              X15

  Turbo switch                X12      Reset switch                X16

  Speaker                     X13      Power LED & keylock         X17

  Turbo LED                   X14

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Factory configured - do not             S1             pins 1 & 2
      alter                                                    closed

  »   Battery installed < 5VDC                S2             pins 1 & 2
                                                               closed

      Battery installed > 5VDC                S2             pins 2 & 3
                                                               closed

  »   CPU speed select switchable             S3             pins 2 & 3
      at keyboard                                              closed

      CPU speed select switchable             S3             pins 1 & 2
      at turbo switch                                          closed

  »   Factory configured - do not           SW1/1               N/A
      alter

  »   NPU disabled                          SW1/2               Off

      NPU enabled                           SW1/2                On

  »   Factory configured - do not           SW1/3               N/A
      alter

  »   Monitor type select                   SW1/4               Off
      monochrome

      Monitor type select color             SW1/4                On

  »   Factory configured - do not            TP1                Off
      alter

  »   Factory configured - do not            TP2                Off
      alter

  »   Factory configured - do not            TP3                Off
      alter

  »   Factory configured - do not            TP4                Off
      alter

  Note: The location of S1 is unidentified.

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

     4MB 2       (4) 1M x 9       NONE           NONE           NONE

     8MB 2       (4) 1M x 9    (4) 1M x 9        NONE           NONE

    12MB 2       (4) 1M x 9    (4) 1M x 9     (4) 1M x 9        NONE

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

    16MB 2       (4) 1M x 9    (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

    16MB 1       (4) 4M x 9       NONE           NONE           NONE

    16MB 2       (4) 4M x 9       NONE           NONE           NONE

    20MB 2       (4) 4M x 9    (4) 1M x 9        NONE           NONE

    24MB 2       (4) 4M x 9    (4) 1M x 9     (4) 1M x 9        NONE

    28MB 2       (4) 4M x 9    (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

    32MB 1       (4) 4M x 9    (4) 4M x 9        NONE           NONE

  Note 1: These memory configurations do not utilize 256KB remapping.

  Note 2: These memory configurations utilize 256KB memory remapping.

  Due to remapping, system memory count on boot-up will reflect 256KB
  less than actual.

                         DRAM SWITCH CONFIGURATION

     Size          SW1/5          SW1/6         SW1/ 7          SW1/8

    4MB 2           On              On            On             On

    8MB 2           On              On            On             Off

    12MB 2          On              On            Off            On

    16MB 1          On              On            Off            Off

    16MB 2          On             Off            On             Off

    16MB 1          On             Off            Off            On

    16MB 2          On             Off            Off            Off

    20MB 2          Off             On            On             On

    24MB 2          Off             On            Off            On

    28MB 2          Off             On            Off            Off

    32MB 1          Off            Off            On             On

  Note 1: These memory configurations do not utilize 256KB remapping.

  Note 2: These memory configurations utilize 256KB-memory remapping.

  Due to remapping, system memory count on boot-up will reflect 256KB
  less than actual.

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     128KB       (16) 8K x 8   (2) 8K x 8