EVERSOURCE COMPUTERS, INC.

USA 486DX

Processor         80486DX
Processor Speed   33/50MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             256KB
BIOS              AMI
Dimensions        330mm x 220mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J2       Reset switch                J6

  Turbo switch                J4       External battery            J7

  Turbo LED                   J5       Speaker                    J100

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color                J3             Closed

      Monitor type select monochrome           J3              Open

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      1MB            NONE        (4) 256K x 9

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      4MB            NONE         (4) 1M x 9

      5MB         (4) 256K x 9   (4) 1 M x 9

      5MB         (4) 1 M x 9    (4) 256K x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      16MB           NONE         (4) 4M x 9

      17MB        (4) 4M x 9     (4) 256K x 9

      17MB        (4) 256K x 9    (4) 4M x 9

      20MB        (4) 4M x 9      (4) 1M x 9

      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    (1) 8K x 1

     128KB      (4) 32K x 8        NONE       (1) 8K x 1

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 8K x 1

  Note:The exact location of TAG is unidentified.

                        CACHE JUMPER CONFIGURATION

      Size              JMP1               JMP2                JMP3

      64KB            pins 1 & 2      pins 1 & 2, 3 &       pins 1 & 2
                       closed            4 closed             closed

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

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