
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

