EFA CORPORATION

ECA 34M33

Processor         80386DX/80486SX/80486DX
Processor Speed   16/20/25/33/40/50MHz
Chip Set          UMC
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J1       Turbo LED                   J4

  Speaker                     J2       Turbo switch                J5

  Reset switch                J3       External battery            J17

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Monitor type select color              J16                Open

      Monitor type select                    J16               Closed
      monochrome

  »   Factory configured - do not            J21                N/A
      alter

  »   BIOS type select 27512                 J22             pins 2 & 3
                                                               closed

      BIOS type select 271024                J22             pins 1 & 2
                                                               closed

  »   CPU type select 80486DX                J23             pins 2 & 3
                                                               closed

      CPU type select 80486SX                J23             pins 1 & 2
                                                               closed

      CPU type select 80386DX                J23                Open

  »   Factory configured - do not           S2/5                N/A
      alter

  »   Factory configured - do not           S2/8                N/A
      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 (U22)      TAG (U24)

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 32K x 8    (1) 16K x 4

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

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

                        CACHE JUMPER CONFIGURATION

  Size    J7  J8     J9      J10      J11      J12      J13     J14   J15

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

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

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

  Note:Pins designated should be in the closed position.

                        CPU TYPE CONFIGURATION (A)

     Type           S3/1           S3/2           S3/3           S3/4

  80386DX-16         Off            Off            On             On

  80386DX-20         Off            Off            On            Off

  80386DX-33         On             On            Off             On

  80386DX-40         On             On             On             On

  80486SX-20         On             Off            On            Off

  80486DX-25         On             Off           Off            Off

  80486DX-33         On             Off           Off             On

  80486DX-50         Off            On            Off            Off

  Note: All CPU configurations (Tables A, B & Jumper J23) must be set for
  proper operation.

                  CPU TYPE CONFIGURATION (B)

   Type       S1/1      S1/2       S1/3       S1/4      S2/1

  80386DX      On        On        Off        Off        On

  80486SX     Off        Off        On         On       Off

  80486DX      On        On        Off        Off       Off

               CPU TYPE CONFIGURATION (B CON’T)

   Type       S2/2      S2/3       S2/4       S2/6      S2/7

  80386DX      On        On         On        Off       Off

  80486SX     Off        Off       Off         On        On

  80486DX     Off        Off       Off         On        On