
EFA CORPORATION

ECA 33M50

Processor           80386DX/80486SX/80486DX
Processor Speed     16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set            UMC
Max. Onboard DRAM   32MB
SRAM 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          Position

     Monitor type select monochrome           J16             open

      Monitor type select color                J16            closed

     Factory configured - do not alter        J21             open

      BIOS type select 64K                     J22           pins 2 & 3
                                                              closed

      BIOS type select 128K                    J22           pins 1 & 2
                                                              closed

                            SRAM CONFIGURATION

     Size        Cache SRAM      Location      TAG (U22)      TAG (U24)

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 32K x 8    (1) 16K x 4

     128KB      (4) 32K x 8       Bank 0      (1) 32K x 8    (1) 16K x 4

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 32K x 8    (1) 16K x 4

                         SRAM 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.

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

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

      16MB        (4) 4M x 9         NONE

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

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

                          CPU TYPE CONFIGURATION

     CPU          S1        S1        S1        S1        S2      Jumper

                switch    switch    switch    switch    switch     J23
                  1         2         3         4        1-6

   80486DX2     closed    closed     open      open      open    pins 1 &
                                                                    2

   ODP486SX     closed    closed     open      open      open    pins 2 &
                                                                    3

   80486DX      closed    closed     open      open      open    pins 1 &
                                                                    2

  80487SX-25    closed    closed     open      open      open    pins 2 &
                                                                    3

  80487SX-20    closed    closed     open     closed     open    pins 2 &
                                                                    3

  80486SX-25     open      open     closed     open      open      open

  80486SX-20     open      open     closed    closed     open      open

   80386DX      closed    closed     open      open     closed     N/A

                          CPU SPEED CONFIGURATION

      CPU        iOSC       S3       S3        S3        S3         S2

                 SPEED    switch    switch    switch    switch    switchs
                            1         2         3         4        1-6

  80486DX2-50    25MHz    closed   closed     open     closed      open

  ODP486SX-66    33MHz    closed    open     closed    closed      open

  ODP486SX-50    25MHz    closed   closed     open     closed      open

  80486DX-50     50MHz     open     open      open      open       open

  80486DX-33     33MHz    closed    open     closed    closed      open

  80486DX-25     25MHz    closed   closed     open     closed      open

  80487SX-25     25MHz    closed   closed     open     closed      open

  80487SX-20     40MHz     open     open     closed     open       open

  80486SX-25     25MHz    closed   closed     open     closed      open

  80486SX-20     40MHz     open     open     closed     open       open

  80386DX-40     80MHz    closed    open      open      open      closed

  80386DX-33     66MHz     open     open      open     closed     closed

  80386DX-20     20MHz    closed   closed    closed     open      closed

  80386DX-16     16MHz    closed   closed    closed    closed     closed

