UNIDENTIFIED

80486-33B

Processor         80486SX/80487SX/80486DX
Processor Speed   33MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
SRAM 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            closed

      Monitor type select monochrome           JP2             open

      Factory configured - do not alter        JP6            closed

  »   CPU speed select iOSC(Y2)/2              JP7           pins 2 & 3
                                                              closed

      CPU speed select iOSC(Y2)/1              JP7           pins 1 & 2
                                                              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) 256K x 9    (4) 1M x 9

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

      16MB        (4) 4M x 9         NONE

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

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

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

                            SRAM CONFIGURATION

    Size        Cache       TAG         JP9          JP10         JP12
                SRAM

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

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

                         CPU JUMPER CONFIGURATION

        CPU               JP3               JP4                JP5

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

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

      80486SX             open              open            pins 2 & 3
                                                             closed