
UNIDENTIFIED

486LC25/33

Processor         80486DX
Processor Speed   25/33MHz
Chip Set          Intel
Max. Onboard DRAM 16MB
Cache             128/256KB
BIOS              AMI/Award/Phoenix
Dimensions        335mm x 277mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J1       Reset switch                J5

  Turbo switch                J3       Turbo LED                   J6

  Speaker                     J4       External battery            JB2

  Note:Pin one locations are unidentified.

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     DRAM speed select 80ns or              JP4             pins 2 & 3
      100ns (for 25Mhz CPU)                                    closed

      DRAM speed select 60ns or              JP4             pins 1 & 2
      80ns (for 33MHz CPU)                                     closed

     Factory configured - do not           SW1/1               N/A
      alter

     Operating system select               SW1/2               Off
      other than SCO UNIX Open
      Desktop

      Operating system select SCO           SW1/2                On
      UNIX Open Desktop

     Monitor type select color             SW1/5                On

      Monitor type select                   SW1/5               Off
      monochrome

     DRAM 32-bit access enabled            SW1/6                On

      DRAM 32-bit access disabled           SW1/6               Off

                            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

     3MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9      NONE

     4MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9  (4) 256K x 9

     4MB        (4) 1M x 9        NONE           NONE           NONE

     8MB        (4) 1M x 9     (4) 1M x 9        NONE           NONE

     12MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     16MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

                         DRAM JUMPER CONFIGURATION

      Size              JP1                JP2                 JP3

      1MB            pins 1 & 2         pins 1 & 2      pins 1 & 2 closed
                      closed              closed

      2MB            pins 2 & 3         pins 1 & 2      pins 1 & 2 closed
                      closed              closed

      3MB            pins 1 & 2         pins 2 & 3      pins 1 & 2 closed
                      closed              closed

     4MB 1           pins 2 & 3         pins 2 & 3      pins 1 & 2 closed
                      closed              closed

     4MB 2           pins 1 & 2         pins 1 & 2      pins 2 & 3 closed
                      closed              closed

      8MB            pins 2 & 3         pins 1 & 2      pins 2 & 3 closed
                      closed              closed

      12MB           pins 1 & 2         pins 2 & 3      pins 2 & 3 closed
                      closed              closed

      16MB           pins 2 & 3         pins 2 & 3      pins 2 & 3 closed
                      closed              closed

  Note 1 :Use this setting when (4) 256K x 9 SIMMs are populating all
  four banks.

  Note 2 :Use this setting when (4) 1M x 9 SIMMs are populating Bank 0.

            CACHE CONFIGURATION

     Size          Bank 0        Bank 1

     128KB       (4) 32K x 8      NONE

     256KB       (4) 32K x 8   (4) 32K x 8

                        CACHE SWITCH CONFIGURATION

                Function                   Switch SW1        Position

     SRAM cache enabled                     SW1/3              On

      SRAM cache disabled                    SW1/3             Off

     DRAM installed between 12MB and        SW1/4              On
      16MB is cached

      DRAM installed between 12MB and        SW1/4             Off
      16MB is not cached

                      BIOS CONFIGURATION

        Size                 JP5                 SW1/7

        27256          pins 1 & 2 closed          Off

        27512          pins 2 & 3 closed           On

