
UNIDENTIFIED

486-EL

Processor    80486SX/80486DX/80486DX2/80486DX4
Processor    25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set     OPTI
Max. Onboard 16MB
DRAM
Cache        8KB (on EDRAM modules)
BIOS         AMI
Dimensions   250mm x 220mm
I/O Options  32-bit VESA local bus slots (3), green PC connector
NPU Options  None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  External battery            JP2       Reset switch              JP27

  Green PC connector          JP3       Power LED & keylock       JP28

  Turbo LED                   JP25      Speaker                   JP30

  Turbo switch                JP26      32-bit VESA local      SL1 - SL3
                                        bus slots

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CMOS memory normal operation            JP1           pins 2 & 3
                                                              closed

      CMOS memory clear                       JP1           pins 1 & 2
                                                              closed

      Green PC IRQ select IRQ10              JP23           pins 1 & 2
                                                              closed

      Green PC IRQ select IRQ11              JP23           pins 2 & 3
                                                              closed

      Green PC timer select short time       JP29             Closed
      (1.5 minutes)

      Green PC timer select long time        JP29              Open
      (8 minutes)

                     DRAM CONFIGURATION

    Size      Bank 0      Bank 1      Bank 2      Bank 3

    4MB         4MB        NONE        NONE        NONE

    8MB         4MB         4MB        NONE        NONE

    8MB         8MB        NONE        NONE        NONE

    12MB        4MB         4MB         4MB        NONE

    16MB        4MB         4MB         4MB         4MB

    16MB        8MB        NONE         8MB        NONE

  Note: This board is only compatible with EDRAM modules.

             CACHE CONFIGURATION

   Memory installed       Cache installed

         4MB                    2KB

         8MB                    4KB

         8MB                    4KB

         12MB                   6KB

         16MB                   8KB

         16MB                   8KB

  Note: Cache is located on EDRAM modules.

                          CPU TYPE CONFIGURATION

       Type               JP19              JP20               JP21

      80486SX             Open           pins 1 & 2         pins 1 & 2
                                           closed             closed

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

     80486DX2            Closed          pins 2 & 3         pins 2 & 3
                                           closed             closed

     80486DX4            Closed          pins 2 & 3         pins 2 & 3
                                           closed             closed

                          CPU SPEED CONFIGURATION

       Speed              JP9              JP10               JP36

       25MHz              Open            Closed        pins 1 & 2 closed

       33MHz             Closed            Open         pins 1 & 2 closed

      50iMHz              Open            Closed        pins 1 & 2 closed

      66iMHz             Closed            Open         pins 1 & 2 closed

      75iMHz              Open            Closed        pins 2 & 3 closed

      100iMHz            Closed            Open         pins 1 & 2 closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

        Speed                  JP35

          2x            pins 1 & 2 closed

         2.5x           pins 2 & 3 closed

          3x                   Open

