
UNIDENTIFIED

407

Processor        80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         OPTI
Max. Onboard DRAM256MB
Cache            128/256/1024KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J4        Speaker                   JP22

  Power LED & keylock         J6        Reset switch               S9

  Turbo LED                  JP15       32-bit VESA local      SL1 - SL3
                                        bus slots

  Turbo switch               JP17

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP2             Closed

      Monitor type select monochrome          JP2              Open

     VESA clock delay enabled                JP12          pins 1 & 2
                                                              closed

      VESA clock delay disabled               JP12          pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

      4MB        (1) 1M x 36       NONE           NONE           NONE

      8MB        (1) 1M x 36   (1) 1M x 36        NONE           NONE

     12MB        (1) 1M x 36   (1) 1M x 36    (1) 1M x 36        NONE

     16MB        (1) 1M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     16MB        (1) 4M x 36       NONE           NONE           NONE

     20MB        (1) 1M x 36   (1) 4M x 36        NONE           NONE

     32MB        (1) 4M x 36   (1) 4M x 36        NONE           NONE

     40MB        (1) 1M x 36   (1) 1M x 36    (1) 4M x 36    (1) 4M x 36

     48MB        (1) 4M x 36   (1) 4M x 36    (1) 4M x 36        NONE

     64MB        (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB        (1) 16M x 36      NONE           NONE           NONE

     80MB        (1) 4M x 36   (1) 16M x 36       NONE           NONE

     128MB       (1) 16M x 36  (1) 16M x 36       NONE           NONE

     160MB       (1) 4M x 36   (1) 4M x 36    (1) 16M x 36   (1) 16M x 36

     192MB       (1) 16M x 36  (1) 16M x 36   (1) 16M x 36       NONE

     208MB       (1) 4M x 36   (1) 16M x 36   (1) 16M x 36   (1) 16M x 36

     256MB       (1) 16M x 36  (1) 16M x 36   (1) 16M x 36   (1) 16M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

     128KB        (4) 32K x 8        NONE        (1) 32K x 8

     256KB        (4) 32K x 8     (4) 32K x 8    (1) 32K x 8

      1MB        (4) 128K x 8    (4) 128K x 8    (1) 128K x 8

                        CACHE JUMPER CONFIGURATION

   Size        JP6          JP7           JP9         JP10        JP13

   128KB       Open      pins 1 & 2    pins 1 & 2     Open       Closed
                           closed       closed

   256KB       Open      pins 2 & 3    pins 2 & 3    Closed      Closed
                           closed       closed

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

                          CPU TYPE CONFIGURATION

           Type                      JP4                     JP5

          80486SX             pins 2 & 3 closed             Open

          80487SX             pins 1 & 2, 3 & 4       pins 1 & 2 closed
                                   closed

          80486DX             pins 1 & 2, 3 & 4       pins 2 & 3 closed
                                   closed

         80486DX2             pins 1 & 2, 3 & 4       pins 2 & 3 closed
                                   closed

     Pentium Overdrive        pins 1 & 2, 3 & 4       pins 1 & 2 closed
                                   closed

                  CPU SPEED CONFIGURATION

  Speed       JPA       JPB       JPC       JP20      JP21

  20MHz      1 & 2     2 & 3     2 & 3     2 & 3     2 & 3

  25MHz      2 & 3     1 & 2     2 & 3     2 & 3     2 & 3

  33MHz      2 & 3     2 & 3     1 & 2     1 & 2     2 & 3

  40MHz      1 & 2     1 & 2     2 & 3     2 & 3     1 & 2

  50iMHz     2 & 3     1 & 2     2 & 3     2 & 3     2 & 3

  50MHz      1 & 2     2 & 3     1 & 2     1 & 2     1 & 2

  66iMHz     2 & 3     2 & 3     1 & 2     1 & 2     2 & 3

  Note: Pins designated should be in the closed position.

                      ADS# SIGNAL DELAY CONFIGURATION

        Speed                    JP3                       JP27

        20MHz              pins 2 & 3 closed         pins 2 & 3 closed
                               (normal)                  (normal)

        25MHz              pins 2 & 3 closed         pins 2 & 3 closed
                               (normal)                  (normal)

        33MHz              pins 2 & 3 closed         pins 2 & 3 closed
                               (normal)                  (normal)

        33MHz              pins 1 & 2 closed         pins 2 & 3 closed
                               (delay)                   (normal)

        40MHz              pins 1 & 2 closed         pins 2 & 3 closed
                               (delay)                   (normal)

        50MHz              pins 1 & 2 closed         pins 1 & 2 closed
                               (delay)                   (delay)

  VESA WAIT STATE CONFIGURATION

   Wait states         JP16

  0 wait states        Open

  1 wait state        Closed

                          BUS SPEED CONFIGURATION

       CPU speed                  JP11                      JP14

        <= 33MHz            pins 1 & 2, 3 & 4               Open
                                 closed

        > 33MHz             pins 2 & 3 closed              Closed

