
EFA CORPORATION

4MAHL, 4DMU-50AHL

Processor     CX486SX/CX487SX/80486SX/80486DX/ODP486SX/80486DX2
Processor     20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set      UMC
Max. Onboard  64MB
DRAM
Cache         32/64/128/256KB
BIOS          AMI
Dimensions    330mm x 218mm
I/O Options   32-bit VESA local bus slots (2), floppy drive interface,

              game port, IDE interface (2), parallel port, serial ports
              (2)
NPU Options   None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  Serial port 2               CN2       Power LED & keylock        J8

  Serial port 1               CN3       Reset switch               J9

  Floppy drive interface      CN11      Game port                 JP1

  IDE interface               CN12      Turbo switch              JP31

  AT bus hard drive           CN13      Turbo LED                 JP32
  interface

  Parallel port               CN14      Speaker                   JP33

  External battery             J1       32-bit VESA Local          S1
                                        bus slot

  Hard drive LED (AT12)        J6       32-bit VESA Local          S2
                                        bus slot

  AT bus hard drive LED        J7

  Note:The exact location of J7 is unknown.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     HDD I/O CHRDY# disabled                  J5              Open

      HDD I/O CHRDY# enabled                   J5             Closed

     Game port enabled                       JP1           pins 1 & 2
                                                              closed

      Game port disabled                      JP1           pins 2 & 3
                                                              closed

     IDE interface disabled                  JP3           pins 2 & 3
                                                              closed

      IDE interface enabled                   JP3           pins 1 & 2
                                                              closed

     Floppy drive interface enabled          JP4           pins 1 & 2
                                                              closed

      Floppy drive interface disabled         JP4           pins 2 & 3
                                                              closed

     AT bus IDE interface or HDC             JP6           pins 2 & 3
      enabled                                                 closed

      AT bus IDE interface or HDC             JP6           pins 1 & 2
      disabled                                                closed

     Factory configured - do not             JP8             Closed
      alter

     Factory configured - do not             JP9              Open
      alter

     Factory configured - do not             JP10             N/A
      alter

     AD12 local bus IDE HDD enabled          JP14          pins 2 & 3
                                                              closed

      AD12 local bus IDE HDD disabled         JP14          pins 1 & 2
                                                              closed

     Factory configured - do not             JP15          pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP17          pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP18          pins 2 & 3
      alter                                                   closed

      80486SX enabled                         JP28          pins 1 & 2
                                                              closed

      Other CPU enabled                       JP28          pins 2 & 3
                                                              closed

     Factory configured - do not             JP29          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP30          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP35          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP39             Open
      alter

     Factory configured - do not             JP40             Open
      alter

     Factory configured - do not             JP41             Open
      alter

     Factory configured - do not             JP42             Open
      alter

     Factory configured - do not             JP50             N/A
      alter

  Note: JP28 is only configurable when you have a 80486SX PQFP mounted on
  the mainboard.

  The exact location of JP41 is unknown.

                         SERIAL PORT CONFIGURATION

        Port 1 (CN3)                  JP7                    JP5

             COM1             Pins 1 & 2 closed      pins 1 & 2 closed

              COM3             Pins 2 & 3 closed      pins 1 & 2 closed

            Disabled                  N/A             pins 2 & 3 closed

                         SERIAL PORT CONFIGURATION

        Port 2 (CN2)                  JP11                   JP13

             COM2             Pins 1 & 2 closed      pins 1 & 2 closed

              COM4             Pins 2 & 3 closed      pins 1 & 2 closed

            Disabled                  N/A             pins 2 & 3 closed

                        PARALLEL PORT CONFIGURATION

            Port                      JP2                    JP12

             LPT2             pins 1 & 2 closed      pins 1 & 2 closed

              LPT3             pins 2 & 3 closed      pins 1 & 2 closed

            Disabled                  N/A             pins 2 & 3 closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      1MB            NONE        (4) 256K x 9

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

      4MB         (4) 1M x 9         NONE

      4MB            NONE         (4) 1M x 9

      5MB         (4) 1M x 9     (4) 256K x 9

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      16MB           NONE         (4) 4M x 9

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

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

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

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

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

      64MB        (4) 16M x 9        NONE

      64MB           NONE        (4) 16M x 9

                    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) 32K x 8

                        CACHE JUMPER CONFIGURATION

    Size        JP21          JP22         JP23        JP26       JP27

    32KB        Open          Open         Open        Open      pins 2 &
                                                                    3

    64KB        Open          Open        Closed       Open      pins 1 &
                                                                    2

   128KB        Open         Closed       Closed     pins 1 &    pins 2 &
                                                        2           3

   256KB       Closed        Closed       Closed     pins 2 &    pins 1 &
                                                        3           2

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      Type        SW1/1    SW1/2   SW1/3   SW1/4   SW1/5    SW1/6   SW1/7

    CX486SX        On      Off      On      Off     On      Off     Off

    CX487SX        On      Off      On      Off     On      Off     Off

     CX486S        Off     Off     Off      On      Off     Off     Off

    80486SX        Off     Off     Off      On      Off     Off     Off

  80486DX(PQFP)    On      Off      On      Off     On       On      On

    80486DX        On      Off      On      Off     On      Off     Off

    ODP486SX       On       On     Off      Off     On      Off     Off

    80486DX2       On      Off      On      Off     On      Off     Off

                CPU TYPE CONFIGURATION (CONT.)

        Speed                JP47                 JP49

       CX486SX               N/A           pins 1 & 2 closed

       CX487SX               N/A                  N/A

  CX486SX + CX487SX         Closed         pins 2 & 3 closed

       CX486S                Open          pins 1 & 2 closed

       80486SX               Open          pins 1 & 2 closed

    80486DX(PQFP)            Open          pins 1 & 2 closed

       80486DX               Open          pins 1 & 2 closed

      ODP486SX               Open          pins 1 & 2 closed

      80486DX2               Open          pins 1 & 2 closed

  Note:The exact location of JP49 is unknown.

                          CPU SPEED CONFIGURATION

    Speed          SW2/1         SW2/2          SW2/3           JP48

    20MHz           Off           Off            Off         pins 2 & 3
                                                               closed

    25MHz           On            Off            Off         pins 2 & 3
                                                               closed

    33MHz           On             On            On          pins 2 & 3
                                                               closed

    40MHz           On             On            Off         pins 1 & 2
                                                               closed

   50i MHz          On            Off            Off         pins 1 & 2
                                                               closed

    50MHz           Off           Off            On          pins 1 & 2
                                                               closed

   66i MHz          On             On            On          pins 1 & 2
                                                               closed

                  VESA WAIT STATE/BUS SPEED CONFIGURATION

     Speed      Wait states        JP36          JP37            JP38

    <=33MHz        0 wait       pins 1 & 2     pins 1 & 2     pins 1 & 2
                   states         closed        closed          closed

    > 33MHz     1 wait state    pins 2 & 3     pins 2 & 3     pins 2 & 3
                                  closed        closed          closed

