
EFA CORPORATION

ECA 34M50FL

Processor        80386DX/CX486DLC/80486SX/80486DX/80486DX2
Processor Speed  16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         UMC
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      80387DX

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J1        Turbo Switch              J13

  Power LED & keylock         J10       Turbo LED                 J14

  Speaker                     J11       Chassis fan power         J15

  Reset switch                J12       32-bit VESA Local       S1 & S2
                                        bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation             W1           pins 1 & 2
                                                              closed

      CMOS memory clear                        W1           pins 2 & 3
                                                              closed

     On board battery enabled                 W2           pins 1 & 2
                                                              closed

      On board battery disabled                W2           pins 2 & 3
                                                              closed

     Factory configured - do not             W14              Open
      alter

              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

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

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

                            CACHE CONFIGURATION

    Size         Bank 0        Bank 1         TAG/U24       Dirty Bit/U37

    64KB       (4) 8K x 8    (4) 8K x 8     (1) 8K x 8      (1) 16K x 8

    128KB      (4) 32K x 8      NONE        (1) 8K x 8      (1) 16K x 8

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

                        CACHE JUMPER CONFIGURATION

   Size    W5    W6     W7     W8       W9       W10      W11       W12

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

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

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

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      Type         SW3/1    SW3/2     SW3/3     SW3/4     SW3/5    SW3/6

    CX486DLC        Off       On        On       Off       Off      Off

   80486SX/20       Off      Off       Off       On        On       Off

   80486SX/25       Off      Off       Off       Off       On       Off

     80486SX        Off      Off       Off       Off       Off      Off
     (PQFP)

     80486DX        Off       On        On       Off       Off      Off

     80486DX        On       Off       Off       Off       Off       On
     (PQFP)

    ODP486SX        Off       On        On       Off       Off      Off

    80486DX2        Off       On        On       Off       Off      Off

                CPU TYPE CONFIGURATION (CONT.)

        Type                 Pins                 J9

       80486SX               168           pins 1 & 2 closed

  80486SX/80486DX2      168 Overdrive      pins 1 & 2 closed

       80486DX          168 Overdrive      pins 2 & 3 closed

       80486DX          169 Overdrive      pins 1 & 2 closed

  80486DX/80486DX2           168           pins 2 & 3 closed

                CPU TYPE CONFIGURATION (CONT.)

   Type     SW2/1    SW2/2    SW2/3   SW2/4    SW2/5    SW2/6

  80386      On       On       On       On       On       On

  80486      Off      Off      Off     Off      Off      Off

         NPU TYPE CONFIGURATION

        Type           SW2/switch 7

  80387DX enabled           On

  80387DX disabled          Off

                 CPU TYPE CONFIGURATION (CONT.)

              Type                             J5

            80486SX                     pins 2 & 3 closed

            80486DX                     pins 2 & 3 closed

            ODP486SX                    pins 1 & 2 closed

            80486DX2                    pins 2 & 3 closed

  Note:This only applies when the 80486SX/DX PQFP is disabled.

                          CPU SPEED CONFIGURATION

     CPU       Speed      Osc.     SW1/1      SW1/2     SW1/3     SW1/4

   80386DX     16MHz     16MHz       On        On        On         On

   80386DX     16MHz     16MHz       On        On        Off       Off

   80386DX     20MHz     20MHz       On        On        On        Off

   80386DX     33MHz     33MHz       On        Off       On         On

   80386DX     40MHz     80MHz       On        Off       Off       Off

   80486SX     20MHz     40MHz      Off        Off       On        Off

   80486SX     25MHz     25MHz       On        On        Off        On

   80487SX     20MHz     40MHz      Off        Off       On        Off

   80487SX     25MHz     25MHz       On        On        Off        On

   80486DX     25MHz     25MHz       On        On        Off        On

   80486DX     33MHz     33MHz       On        Off       On         On

   80486DX     50MHz     50MHz      Off        Off       Off       Off

  ODP486SX     50i MHz   25MHz       On        On        Off        On

  ODP486SX     66i MHz   33MHz       On        Off       On         On

  80486DX2     50i MHz   25MHz       On        On        Off        On

  80486DX2     66i MHz   33MHz       On        Off       On         On

                  VESA WAIT STATE/BUS SPEED CONFIGURATION

  CPU speed     Wait states        J4             J6             J7

  Auto detect   Auto select      Closed          Open          Closed

     33MHz        0 wait        Closed         Closed          Open
                  states

    > 33MHz        1 wait         Open          Closed         Closed
                   state

