UNIDENTIFIED

486WB CACHE

Processor         80486SX/80487SX/80486DX
Processor Speed   25/33MHz
Chip Set          OPTI
Max. Onboard DRAM 64MB
Cache             64/128/256/512KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                      J3       Turbo switch              JP18

  External battery             J7       Turbo LED                 JP20

  Power LED & keylock          J8       Reset switch              JP21

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CPU speed select forced high            JP18            Closed

      CPU speed select switchable at          JP18             Open
      keyboard

  »   Power good signal detect from           JP23           pins 1 & 2
      power supply                                            closed

      Power good signal detect from           JP23           pins 2 & 3
      board                                                   closed

  »   CMOS memory normal operation            JP24           pins 2 & 3
                                                              closed

      CMOS memory clear                       JP24           pins 1 & 2
                                                              closed

  »   Monitor type select color               JP25           pins 2 & 3
                                                              closed

      Monitor type select monochrome          JP25           pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

     Size         Bank 0          Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9       NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9       NONE           NONE

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

     5MB        (4) 256K x 9   (4) 1 M x 9        NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9    (4) 1M x 9        NONE

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

     9MB        (4) 256K x 9    (4) 1M x 9     (4) 1M x 9        NONE

     10MB       (4) 256K x 9   (4) 256K x 9    (4) 1M x 9     (4) 1M x 9

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

     13MB       (4) 256K x 9    (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

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

     16-B       (4) 4M x 9         NONE           NONE           NONE

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

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

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

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

     36MB       (4) 1M x 9      (4) 4M x 9     (4) 4M x 9        NONE

     40MB       (4) 1M x 9      (4) 4M x 9     (4) 4M x 9     (4) 1M x 9

     48MB       (4) 4M x 9      (4) 4M x 9     (4) 4M x 9        NONE

     52MB       (4) 4M x 9      (4) 4M x 9     (4) 4M x 9     (4) 1M x 9

     64MB       (4) 4M x 9      (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2         Bank 3

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

     128KB       (4) 8K x 8     (4) 8K x 8    (4) 8K x 8     (4) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8       NONE           NONE

     512KB      (4) 32K x 8    (4) 32K x 8    (4) 32K x 8    (4) 32K x 8

                  CACHE TAG CONFIGURATION

     Size           U27            U36            U37

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

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

     256KB      (1) 32K x 8        NONE       (1) 64K x 8

     512KB      (1) 32K x 8        NONE       (1) 64K x 8

                 CACHE JUMPER CONFIGURATION

   Size       JP9      JP10       JP11      JP12      JP13

   64KB      2 & 3     2 & 3     2 & 3     2 & 3     2 & 3

  128KB      1 & 2     1 & 2     2 & 3     2 & 3     2 & 3

  256KB      1 & 2     1 & 2     1 & 2     2 & 3     2 & 3

  512KB      1 & 2     1 & 2     1 & 2     1 & 2     1 & 2

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type               JP1               JP2                JP3

     80486SX           pins 2 & 3        pins 2 & 3            Open
                        closed             closed

     80487SX           pins 1 & 2        pins 1 & 2         pins 1 & 2
                        closed             closed             closed

     80486DX           pins 1 & 2        pins 1 & 2         pins 2 & 3
                        closed             closed             closed