UNIDENTIFIED

P486DX

Processor           80486SX/80487SX/80486DX/80486DX2
Processor Speed     20/25/33/50(internal)/50/66(internal)MHz
Chip Set            OPTI
Max. Onboard DRAM   32MB
SRAM Cache          64/128/256KB
BIOS                AMI
Dimensions          220mm x 220mm
I/O Options         None
NPU Options         None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J9       Turbo switch              JP13

  Power LED & keylock         J20       Turbo LED                 JP14

  Speaker                     JP12      Reset switch               S1

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select monochrome           JP1             open

      Monitor type select color                JP1            closed

  »   Battery select internal                  JP2           pins 2 & 3
                                                              closed

      Battery select external                  JP2             open

      CMOS memory clear                        JP2           pins 1 & 2
                                                              closed

  »   CPU speed select iOSC/2                  JP7           pins 2 & 3
      (oscillator located at U30)                             closed
                                              JP11
                                                               open

      CPU speed select iOSC/1                  JP7           pins 1 & 2
      (oscillator located at U30)                             closed
                                              JP11
                                                              closed

                          CPU TYPE CONFIGURATION

      CPU Type              JP5               JP6              JP10

  80486DX/80486DX2       pins 1 & 2         closed           pins 1 & 2
                           closed                             closed

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

       80486SX           pins 2 & 3          open              open
                           closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      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

                         SRAM JUMPER CONFIGURATION

      Jumper             64KB              128KB              256KB

       JP3            pins 2 & 3         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       JP4            pins 2 & 3         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       JP8               open              open              closed

       JP9               open             closed             closed

       JP15              open             closed             closed

       JP16              open              open              closed

                    SRAM CONFIGURATION

     Size        Cache SRAM      Location         TAG

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 8K x 8

     128KB      (4) 32K x 8       Bank 0      (1) 8K x 8

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 8K x 8