MAGITRONICS

486SX/486DX/486DX2 (VER. 2)

Processor        80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         Unidentified
Max. Onboard DRAM64MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       254mm x 220mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J1        Speaker                   JP16

  Power LED & keylock         J21       Reset switch               S1

  Turbo LED                  JP12       32-bit VESA local      SL1 - SL3
                                        bus slots

  Turbo switch               JP13

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation            JP1           pins 2 & 3
                                                              closed

      CMOS memory clear                       JP1           pins 1 & 2
                                                              closed

  »   Monitor type select color               JP2             Closed

      Monitor type select monochrome          JP2              Open

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      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

      17MB        (4) 256K x 9    (4) 4M x 9

      20MB        (4) 1M x 9      (4) 4M x 9

      20MB        (4) 4M x 9      (4) 1M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

      64MB        (4) 16M x 9        NONE

                            CACHE CONFIGURATION

       Size             Bank 0           Bank 1               TAG

       64KB           (4) 8K x 8       (4) 8K x 8          (1) 8K x 8

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

       256KB          (4) 32K x 8      (4) 32K x 8     (1) 16K x 8 or (1)
                                                            32K x 8

                        CACHE JUMPER CONFIGURATION

    Size          JP3             JP5             JP8            JP9

    64KB       pins 2 & 3      pins 2 & 3        Open           Open
                 closed          closed

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

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

                          CPU TYPE CONFIGURATION

        Type                JP6               JP7               JP11

       80486SX           pins 2 & 3        pins 2 & 3           Open
                           closed            closed

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

         CPU SPEED CONFIGURATION

  Speed      JP18      JP19      JP20

  25MHz     Closed     Open     Closed

  33MHz     Closed    Closed     Open

  40MHz      Open      Open     Closed

  50iMHz    Closed     Open     Closed

  50MHz      Open     Closed     Open

  66iMHz    Closed    Closed     Open

       CPU ADS DELAY CONFIGURATION

        Speed                JP21

        33MHz         pins 2 & 3 closed

        40MHz         pins 1 & 2 closed

        50MHz         pins 1 & 2 closed

       66iMHz         pins 2 & 3 closed

       VESA WAIT STATE CONFIGURATION

     Wait states              JP17

    0 wait states             Open

    1 wait state             Closed

  Note: The location of JP17 is unknown.

          BUS SPEED CONFIGURATION

      CPU speed               JP14

      <= 33MHz                Open

       > 33MHz               Closed

  Note: The location of JP14 is unknown.

                       MISCELLANEOUS TECHNICAL NOTE

            Note:The location of jumpers on diagram are for
            identification purposes and may not be the actual location.