
EFA CORPORATION

4MHL3G

Processor  CXM6/SL80486SX/80486SX/SL80486DX/80486DX/ODP486SX/CXM7/
           SL80486DX2/80486DX2/80486DX4/Pentium Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Max.       128MB
Onboard
DRAM
Cache      64/128/256/512/1024KB
BIOS       AMI
Dimensions 330mm x 218mm
I/O        32-bit VESA local bus slots (3), green PC connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  External battery          JP1       Turbo LED                   JP52

  Turbo switch              JP48      Turbo key                   JP53

  Reset switch              JP49      Green PC connector          JP54

  Power LED & keylock       JP50      32-bit VESA local bus    SL1 - SL3
                                      slots

  Speaker                   JP51

                        USER CONFIGURABLE SETTINGS

                 Function                     Jumper         Position

     Monitor type select EGA                  JP2           pins 2 & 3
                                                              closed

      Monitor type select monochrome/VGA       JP2           pins 1 & 2
                                                              closed

     Factory configured - do not alter        JP4             Open

     CMOS memory normal operation             JP5           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP5           pins 2 & 3
                                                              closed

     Factory configured - do not alter        JP12            Open

     Factory configured - do not alter        JP25            Open

     DX slow down mode disabled               JP37            Open

      DX slow down mode enabled                JP37           Closed

     Factory configured - do not alter        JP38            Open

     Factory configured - do not alter        JP45            Open

     Factory configured - do not alter        JP55            Open

  Note: The location of jumpers JP45 & JP55 are unidentified.

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2          Bank 3

     1MB         (1) 256K x       NONE           NONE            NONE
                    36

     2MB         (1) 256K x     (1) 256K x       NONE            NONE
                    36             36

     2MB         (1) 512K x       NONE           NONE            NONE
                    36

     4MB         (1) 256K x     (1) 256K x     (1) 512K x        NONE
                    36             36             36

     4MB         (1) 512K x     (1) 512K x       NONE            NONE
                    36             36

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

     5MB         (1) 256K x    (1) 1M x 36       NONE            NONE
                    36

     6MB         (1) 256K x     (1) 256K x    (1) 1M x 36        NONE
                    36             36

     6MB         (1) 512K x    (1) 1M x 36       NONE            NONE
                    36

     8MB         (1) 256K x     (1) 256K x     (1) 512K x        NONE
                    36             36             36

     8MB         (1) 512K x     (1) 512K x    (1) 1M x 36        NONE
                    36             36

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

     8MB        (1) 2M x 36       NONE           NONE            NONE

     10MB        (1) 256K x     (1) 256K x    (1) 1M x 36    (1) 1M x 36
                    36             36

     12MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 1M x 36
                    36             36

     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) 2M x 36    (1) 2M x 36       NONE            NONE

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

     17MB        (1) 256K x    (1) 4M x 36       NONE            NONE
                    36

     18MB        (1) 256K x     (1) 256K x    (1) 4M x 36        NONE
                    36             36

     18MB        (1) 512K x    (1) 4M x 36       NONE            NONE
                    36

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

     24MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 4M x 36
                    36             36

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36        NONE

     24MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36        NONE

     32MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

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

     32MB        (1) 8M x 36       NONE           NONE           NONE

     36MB         (1) 512K x     (1) 512K x    (1) 4M x 36   (1) 4M x 36
                     36             36

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

     36MB        (1) 1M x 36    (1) 8M 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

     48MB        (1) 4M x 36    (1) 8M x 36       NONE           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

     64MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36       NONE

     64MB        (1) 8M x 36    (1) 8M x 36       NONE           NONE

     65MB         (1) 256K x    (1) 16M x 36      NONE           NONE
                     36

     68MB        (1) 1M x 36    (1) 16M x 36      NONE           NONE

     68MB        (1) 1M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     72MB        (1) 1M x 36    (1) 1M x 36     (1) 16M x        NONE
                                                   36

     72MB        (1) 1M x 36    (1) 1M x 36    (1) 8M x 36   (1) 8M x 36

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

     80MB        (1) 4M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     96MB        (1) 4M x 36    (1) 4M x 36     (1) 16M x        NONE
                                                   36

     96MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36   (1) 8M x 36

     96MB        (1) 8M x 36    (1) 8M x 36    (1) 8M x 36       NONE

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

     128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

                      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) 32K x 8

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

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

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

                        CACHE JUMPER CONFIGURATION

   Size      JP9     JP27     JP28     JP35     JP41     JP42      JP43

   64KB     1 & 2   2 & 3     Open     2 & 3    1 & 2    1 & 2     1 & 2

  128KB     2 & 3   1 & 2    1 & 2,    2 & 3    1 & 2    1 & 2     2 & 3
                             3 & 4

  256KB     1 & 2   1 & 2    2 & 3,    2 & 3    1 & 2    2 & 3     2 & 3
                             4 & 5

  512KB     2 & 3   1 & 2    1 & 2,    2 & 3    2 & 3    2 & 3     2 & 3
                             3 & 4

   1MB      1 & 2   1 & 2    2 & 3,    1 & 2    2 & 3    2 & 3     2 & 3
                             4 & 5

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

     Type         JP7       JP11      JP16      JP17     JP18      JP19

     CXM6        Open       1 & 2    2 & 3     2 & 3     2 & 3     2 & 3

  SL80486SX     Closed      2 & 3    4 & 5     1 & 2     2 & 3     Open

   80486SX       Open       Open      Open      Open     2 & 3     Open

   ODP486SX      Open       Open      Open      Open     2 & 3     Open

  SL80486DX     Closed      2 & 3    4 & 5     1 & 2     2 & 3     Open

   80486DX       Open       Open      Open      Open     2 & 3     Open

     CXM7        Open       1 & 2    2 & 3     2 & 3     2 & 3     2 & 3

  SL80486DX2    Closed      2 & 3    4 & 5     1 & 2     2 & 3     Open

   80486DX2      Open       Open      Open      Open     2 & 3     Open

   80486DX4     Closed      2 & 3    4 & 5     1 & 2     2 & 3     Open

     P24T        Open       2 & 3    1 & 2     1 & 2     1 & 2     1 & 2

  Note: Pins designated should be in the closed postion.

                      CPU TYPE CONFIGURATION (CONT)

     Type      JP19    JP20   JP21   JP22    JP23     JP29   JP30   JP31

     CXM6       2 &    1 &    2 &    Open    Open     2 &    1 &    2 & 3
                3       2      3                       3      2

  SL80486SX    Open    Open   2 &    Open    Open     2 &    2 &    1 & 2
                               3                       3      3

   80486SX     Open    Open   2 &    Open    Open     2 &    2 &    1 & 2
                               3                       3      3

   ODP486SX    Open    Open   1 &     2 &   Closed    2 &    2 &    1 & 2
                               2      3                3      3

  SL80486DX    Open    Open   1 &     1 &   Closed    2 &    2 &    1 & 2
                               2      2                3      3

   80486DX     Open    Open   1 &     1 &   Closed    2 &    2 &    1 & 2
                               2      2                3      3

     CXM7       2 &    1 &    1 &     1 &   Closed    2 &    1 &    2 & 3
                3       2      2      2                3      2

  SL80486DX2   Open    Open   1 &     1 &   Closed    2 &    2 &    1 & 2
                               2      2                3      3

   80486DX2    Open    Open   1 &     1 &   Closed    2 &    2 &    1 & 2
                               2      2                3      3

   80486DX4    Open    Open   1 &     1 &   Closed    2 &    2 &    1 & 2
                               2      2                3      3

     P24T       1 &    2 &    1 &     2 &   Closed    2 &    2 &    2 & 3
                2       3      2      3                3      3

  Note: Pins designated should be in the closed postion. The location fof
  JP29 is unidentified.

                    CPU TYPE CONFIGURATION

        Type                 jp6                  jp26

    All CPU types            Open          pins 1 & 2 closed

    80486DX4 only      pins 1 & 2 closed   pins 2 & 3 closed

                      CPU TYPE CONFIGURATION

      Type             JP8              JP14            JP15

  All CPU types        Open             Open            Open

    P24D only         Closed           Closed          Closed

          CPU TYPE CONFIGURATION

        Type                 JP10

    All CPU types            Open

     CX486DX-40       pins 2 & 3 closed

     CX486DX2-50      pins 1 & 2 closed

      CPU TYPE CONFIGURATION

      Type             JP24

  All CPU types        Open

  CX M6/M7 CPU        Closed

                          CPU SPEED CONFIGURATION

      Speed              JP32               JP33               JP34

      20MHz            pins 1 & 2        pins 2 & 3         pins 2 & 3
                        closed             closed             closed

      25MHz            pins 2 & 3        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

      33MHz            pins 2 & 3        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

      40MHz            pins 1 & 2        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

      50iMHz           pins 2 & 3        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

      50MHz            pins 1 & 2        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

      66iMHz           pins 2 & 3        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

      75iMHz           pins 2 & 3        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

     100iMHz           pins 2 & 3        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

                         CPU VOLTAGE CONFIGURATION

         Voltage                   JP13                     JP44

          3.3v               pins 2 & 3, 5 & 6       pins 1 & 2 closed
                                  closed

          5.0v               pins 1 & 2, 4 & 5       pins 2 & 3 closed
                                  closed

      VESA WAIT STATE CONFIGURATION

     Wait states             JP40

    0 wait states     pins 1 & 2 closed

    1 wait state      pins 2 & 3 closed

         BUS SPEED CONFIGURATION

      CPU speed              JP39

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

