
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

