
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

