UNIDENTIFIED

80486 CACHE SYSTEM

Processor         80486SX/80487SX/80486DX
Processor Speed   25/33/40/50MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit system card
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Speaker                     J1       Turbo switch                J5

  Power LED & keylock         J2       External battery            J6

  Reset switch                J3       32-bit system card          SL1

  Turbo LED                   J4

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   NPU wait state select 0 wait            JP1              Open
      states

      NPU wait state select 1 wait            JP1             Closed
      state

  »   Monitor type select color               JP2              Open

      Monitor type select monochrome          JP2             Closed

  »   Factory configured - do not             JP17             Open
      alter

  »   Factory configured - do not             JPA              Open
      alter

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

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

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

      4MB         (4) 1M x 9         NONE

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

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

      16MB        (4) 4M x 9         NONE

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

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

      32MB        (4) 4M x 9      (4) 4M x 9

            CACHE CONFIGURATION

     Size          Bank 0        Bank 1

     64KB        (4) 8K x 8    (4) 8K x 8

     128KB       (4) 32K x 8      NONE

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

                        CACHE CONFIGURATION (TAG)

     Size           U15            U16            U17            U18

     64KB           NONE           NONE       (1) 16K x 4    (1) 8K x 8

     128KB          NONE           NONE       (1) 16K x 4    (1) 8K x 8

     256KB      (1) 16K x 4    (1) 16K x 4    (1) 16K x 4       NONE

                        CACHE JUMPER CONFIGURATION

    Size          JP6            JP7            JP8             JP9

    64KB          Open           Open           Open            Open

   128KB         Closed          Open          Closed        pins 2 & 3
                                                               closed

   256KB         Closed         Closed         Closed        pins 1 & 2
                                                               closed

                          CPU TYPE CONFIGURATION

       Type               JP3               JP4                JP5

      80486SX            Open            pins 1 & 2           Open
                                          closed

      80487SX           Closed           pins 2 & 3         pins 1 & 2
                                          closed             closed

      80486DX           Closed           pins 2 & 3         pins 2 & 3
                                          closed             closed

                        CLOCK SELECT CONFIGURATION

      Clock              JP10               JP11               JP12

      CLK/3            pins 1 & 2          Closed              Open
                        closed

      CLK/4            pins 1 & 2           Open              Closed
                        closed

      ECLK/5           pins 1 & 2           Open               Open
                        closed

      CLK/6            pins 1 & 2          Closed             Closed
                        closed