
EFA CORPORATION

4MHL3S

Processor        CX486SX/80486SX/CX486DX/80486DX/80486DX2
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         UMC
Max. Onboard DRAM64MB
Cache            32/64/128/256KB
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          JP21      Reset switch                JP26

  Power LED & keylock       JP22      Green PC connector          JP28

  Speaker                   JP23      32-bit VESA Local bus        S1
                                      slot

  Turbo LED                 JP24      32-bit VESA Local bus        S2
                                      slot

  Turbo switch              JP25      32-bit VESA Local bus        S3
                                      slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

      External battery enabled                JP1              Open

      Internal battery enabled                JP1             Closed

      CPU CX486SX & CX487SX enabled           JP6           pins 1 & 2
                                                              closed

      CPU CX486SX & CX487SX disabled          JP6              Open

     Trident 9000 video card not             JP8           pins 1 & 2
      installed                                               closed

      Trident 9000 video card                 JP8           pins 2 & 3
      installed                                               closed

     External green card enabled             JP10          pins 2 & 3
                                                              closed

      External green card disabled            JP10          pins 1 & 2
                                                              closed

     Factory configured - do not             JP13          pins 1 & 2
      alter                                                   closed

      32K x 8 TAG enabled                     JP27          pins 1 & 2
                                                              closed

      16K x 8 TAG enabled                     JP27          pins 2 & 3
                                                              closed

     Factory configured - do not             JP29          pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP30          pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP31            Closed
      alter

                          DRAM CONFIGURATION

       Size             Bank 0           Bank 1           Bank 2

       1MB           (4) 256K x 9         NONE             NONE

       2MB           (4) 256K x 9    (1) 256K x 36         NONE

       2MB           (4) 256K x 9         NONE         (1) 256K x 36

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

       2MB               NONE        (1) 512K x 36         NONE

       2MB               NONE             NONE         (1) 512K x 36

       3MB           (4) 256K x 9    (1) 256K x 36     (1) 256K x 36

       3MB           (4) 256K x 9    (1) 512K x 36         NONE

       3MB               NONE        (1) 512K x 36     (1) 256K x 36

       3MB               NONE        (1) 256K x 36     (1) 512K x 36

       4MB            (4) 1M x 9          NONE             NONE

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

       4MB           (4) 256K x 9    (1) 512K x 36     (1) 256K x 36

       5MB            (4) 1M x 9     (1) 256K x 36         NONE

       5MB            (4) 1M x 9          NONE         (1) 256K x 36

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

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

       5MB           (4) 256K x 9     (1) 1M x 36          NONE

       5MB           (4) 256K x 9         NONE          (1) 1M x 36

       6MB            (4) 1M x 9     (1) 256K x 36     (1) 256K x 36

       6MB           (4) 256K x 9     (1) 1M x 36      (1) 256K x 36

       6MB           (4) 256K x 9    (1) 256K x 36      (1) 1M x 36

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

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

       7MB            (4) 1M x 9     (1) 512K x 36     (1) 256K x 36

       8MB            (4) 1M x 9      (1) 1M x 36          NONE

       8MB            (4) 1M x 9          NONE          (1) 1M x 36

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

                      DRAM CONFIGURATION (CONT.)

       Size             Bank 0           Bank 1           Bank 2

       9MB            (4) 1M x 9      (1) 1M x 36      (1) 256K x 36

       9MB            (4) 1M x 9     (1) 256K x 36      (1) 1M x 36

       9MB           (4) 256K x 9     (1) 1M x 36       (1) 1M x 36

       10MB              NONE         (1) 2M x 36      (1) 512K x 36

       10MB           (4) 1M x 9     (1) 512K x 36      (1) 1M x 36

       12MB           (4) 1M x 9      (1) 1M x 36       (1) 1M x 36

       12MB           (4) 1M x 9      (1) 2M x 36          NONE

       12MB              NONE         (1) 2M x 36       (1) 1M x 36

       12MB              NONE         (1) 1M x 36       (1) 2M x 36

       13MB          (4) 256K x 9     (1) 2M x 36       (1) 1M x 36

       13MB           (4) 1M x 9      (1) 2M x 36      (1) 256K x 36

       16MB           (4) 4M x 9          NONE             NONE

       16MB           (4) 1M x 9      (1) 2M x 36       (1) 1M x 36

       16MB              NONE         (1) 2M x 36       (1) 2M x 36

       17MB           (4) 4M x 9     (1) 256K x 36         NONE

       17MB           (4) 4M x 9          NONE         (1) 256K x 36

       17MB          (4) 256K x 9     (1) 4M x 36          NONE

       17MB          (4) 256K x 9         NONE          (1) 4M x 36

       18MB           (4) 4M x 9     (1) 256K x 36     (1) 256K x 36

       18MB          (4) 256K x 9     (1) 4M x 36      (1) 256K x 36

       18MB          (4) 256K x 9    (1) 256K x 36      (1) 4M x 36

       19MB           (4) 4M x 9     (1) 512K x 36     (1) 256K x 36

       20MB           (4) 4M x 9      (1) 1M x 36          NONE

       20MB           (4) 4M x 9          NONE          (1) 1M x 36

       20MB           (4) 1M x 9      (1) 4M x 36          NONE

       20MB           (4) 1M x 9          NONE          (1) 4M x 36

       21MB          (4) 256K x 9     (1) 4M x 36       (1) 1M x 36

       21MB          (4) 256K x 9     (1) 1M x 36       (1) 4M x 36

       21MB           (4) 1M x 9      (1) 4M x 36      (1) 256K x 36

       21MB           (4) 1M x 9     (1) 256K x 36      (1) 4M x 36

       21MB           (4) 4M x 9      (1) 1M x 36      (1) 256K x 36

       21MB           (4) 4M x 9     (1) 256K x 36      (1) 1M x 36

       22MB           (4) 4M x 9     (1) 512K x 36      (1) 1M x 36

       24MB           (4) 4M x 9      (1) 1M x 36       (1) 1M x 36

       24MB           (4) 1M x 9      (1) 4M x 36       (1) 1M x 36

       24MB           (4) 1M x 9      (1) 1M x 36       (1) 4M x 36

       24MB              NONE         (1) 4M x 36       (1) 2M x 36

       24MB              NONE         (1) 2M x 36       (1) 4M x 36

       25MB          (4) 256K x 9     (1) 2M x 36       (1) 4M x 36

       25MB           (4) 4M x 9      (1) 2M x 36      (1) 256K x 36

       28MB           (4) 4M x 9      (1) 2M x 36       (1) 1M x 36

       28MB           (4) 1M x 9      (1) 2M x 36       (1) 4M x 36

       32MB           (4) 4M x 9      (1) 4M x 36          NONE

       32MB           (4) 4M x 9          NONE          (1) 4M x 36

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

                      DRAM CONFIGURATION (CONT.)

       Size             Bank 0           Bank 1           Bank 2

       33MB          (4) 256K x 9     (1) 4M x 36       (1) 4M x 36

       33MB           (4) 4M x 9     (1) 256K x 36      (1) 4M x 36

       33MB           (4) 4M x 9      (1) 4M x 36      (1) 256K x 36

       34MB           (4) 4M x 9     (1) 512K x 36      (1) 4M x 36

       36MB           (4) 1M x 9      (1) 4M x 36       (1) 4M x 36

       36MB           (4) 4M x 9      (1) 1M x 36       (1) 4M x 36

       36MB           (4) 4M x 9      (1) 4M x 36       (1) 1M x 36

       40MB           (4) 4M x 9      (1) 2M x 36       (1) 4M x 36

       48MB           (4) 4M x 9      (1) 4M x 36       (1) 4M x 36

       64MB          (4) 16M x 9          NONE             NONE

                CLOCK GENERATOR CONFIGURATION

     Clock Type              JP32                JP33

       MX8310          pins 1 & 2 closed         Open

       MX8315                Open               Closed

                  CACHE CONFIGURATION

    Size         Bank 0        Bank 1          TAG

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

    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

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

                        CACHE JUMPER CONFIGURATION

  Size      JP15        JP16         JP17          JP19          JP20

  32KB     pins 2 &     Open         Open          Open          Open
              3

  64KB     pins 1 &     Open         Open         Closed         Open
              2

  128KB    pins 2 &    pins 2 &     Closed        Closed         Open
              3           3

  256KB    pins 1 &    pins 1 &     Closed        Closed        Closed
              2           2

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

             Type                      JP9                   JP11

           80486SX                     Open            pins 2 & 3 closed

           ODP486SX             pins 2 & 3 closed     pins 1 & 2, and 3 &
                                                           4 closed

       CX486SX/CX487SX          pins 1 & 2 closed     pins 1 & 2, and 3 &
                                                           4 closed

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

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

                          CPU SPEED CONFIGURATION

    Speed         JP2            JP3            JP4             JP7

    20MHz         Open           Open           Open         pins 1 & 2
                                                               closed

    25MHz        Closed          Open           Open         pins 1 & 2
                                                               closed

    33MHz        Closed         Closed         Closed        pins 1 & 2
                                                               closed

    40MHz        Closed         Closed          Open         pins 2 & 3
                                                               closed

   50i MHz       Closed          Open           Open         pins 1 & 2
                                                               closed

    50MHz         Open           Open          Closed        pins 2 & 3
                                                               closed

   66i MHz       Closed         Closed         Closed        pins 1 & 2
                                                               closed

                        NPU TYPE CONFIGURATION

          Type                   JP12                    JP14

  Intel CPU or CX486SX     pins 2 & 3 closed             Open

   CX486SX & CX487SX       pins 1 & 2 closed      pins 2 & 3 closed

     VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU speed      Wait states          JP18

      33MHz      0 wait states         Open

     > 33MHz       1 wait state        Closed

