MULTIBEST INDUSTRIAL & MANUFACTURING, INC.

MB4861DX/SX

Processor         80486SX/80486DX
Processor Speed   20/25/33MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery            J11       Turbo LED                 JP11

  Power LED & keylock         J20       Reset switch               SW1

  Speaker                     J21       Turbo switch               SW2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             JP1           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP1           pins 1 & 2
                                                              closed

  »   Monitor type select color                JP2             Open

      Monitor type select monochrome           JP2            Closed

  »   Bus speed select ATCLK/4                 JP6             Open

      Bus speed select ATCLK/6                 JP6            Closed

  »   CPU clock select iOSC/2                  JP7            Closed

      CPU clock select iOSC/1                  JP7             Open

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

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

      16MB        (4) 4M x 9         NONE

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

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

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     64KB        (8) 8K x 8    (1) 8K x 8

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

           CACHE JUMPER CONFIGURATION

   Size      JP8       JP9      JP10      JP12

   64KB     Open      Open      Open      Open

  256KB     Open     Closed    Closed    Closed

                         CPU TYPE CONFIGURATION

   Type             JP3                 JP4                  JP5

  80486SX          Open                 Open          pins 2 & 3 closed

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