
EFA CORPORATION

P55TPIO

Processor          Pentium
Processor Speed    75/90/100/120/133/150/166MHz
Chip Set           Intel
Max. Onboard DRAM  128MB
Cache              256/512KB
BIOS               Award
Dimensions         290mm x 220mm
I/O Options        32-bit PCI slots (4), floppy drive interface, green PC
                   connector, IDE interfaces (2), parallel port, serial
                   ports (2), VRM connector, cache slot
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port 1              CN1       Power LED & keylock        J11

  Serial port 2              CN2       IDE interface LED          J12

  Parallel port              CN3       Green PC connector         J13

  Floppy drive interface     CN4       Turbo LED                  J14

  IDE interface 1            CN5       Turbo switch               J15

  IDE interface 2            CN6       Reset switch               J16

  VRM connector              CN7       32-bit PCI slots         PC1 - PC4

  Speaker                    J10       Cache slot                 SL1

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     Flash BIOS voltage select 5v            JP9           pins 1 & 2
                                                              closed

      Flash BIOS voltage select 12v           JP9           pins 2 & 3
                                                              closed

     CMOS memory normal operation           JP19              Open

      CMOS memory clear                      JP19             Closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       2MB        (2) 256K x 36         NONE

       4MB        (2) 512K x 36         NONE

       4MB        (2) 256K x 36    (2) 256K x 36

       6MB        (2) 512K x 36    (2) 256K x 36

       6MB        (2) 256K x 36    (2) 512K x 36

       8MB         (2) 1M x 36          NONE

       8MB        (2) 512K x 36    (2) 512K x 36

      10MB         (2) 1M x 36     (2) 256K x 36

      10MB        (2) 256K x 36     (2) 1M x 36

      12MB         (2) 1M x 36     (2) 512K x 36

      12MB        (2) 512K x 36     (2) 1M x 36

      16MB         (2) 2M x 36          NONE

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

      18MB         (2) 2M x 36     (2) 256K x 36

      18MB        (2) 256K x 36     (2) 2M x 36

      20MB         (2) 2M x 36     (2) 512K x 36

      20MB        (2) 512K x 36     (2) 2M x 36

      24MB         (2) 2M x 36      (2) 1M x 36

      24MB         (2) 1M x 36      (2) 2M x 36

      32MB         (2) 4M x 36          NONE

      32MB         (2) 2M x 36      (2) 2M x 36

      34MB         (2) 4M x 36     (2) 256K x 36

      34MB        (2) 256K x 36     (2) 4M x 36

      36MB         (2) 4M x 36     (2) 512K x 36

      36MB        (2) 512K x 36     (2) 4M x 36

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

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

      48MB         (2) 4M x 36      (2) 2M x 36

      48MB         (2) 2M x 36      (2) 4M x 36

      64MB         (2) 8M x 36          NONE

      64MB         (2) 4M x 36      (2) 4M x 36

      66MB         (2) 8M x 36     (2) 256K x 36

      66MB        (2) 256K x 36     (2) 8M x 36

      68MB         (2) 8M x 36     (2) 512K x 36

      68MB        (2) 512K x 36     (2) 8M x 36

      72MB         (2) 8M x 36      (2) 1M x 36

      72MB         (2) 1M x 36      (2) 8M x 36

            DRAM CONFIGURATION (CONT)

      Size            Bank 0           Bank 1

      80MB         (2) 8M x 36      (2) 2M x 36

      80MB         (2) 2M x 36      (2) 8M x 36

      96MB         (2) 8M x 36      (2) 4M x 36

      96MB         (2) 4M x 36      (2) 8M x 36

      128MB        (2) 8M x 36      (2) 8M x 36

  Note: Board will also accept non-parity chips.

                        CACHE CONFIGURATION

      Size            Bank 0            TAG              SL1

    256KB (A)      (8) 32K x 8      (1) 32K x 8     Not installed

    256KB (B)          NONE             NONE          Installed

    512KB (A)      (8) 64K x 8      (1) 32K x 8     Not installed

    512KB (B)          NONE             NONE          Installed

                        CACHE JUMPER CONFIGURATION

    Size         JP10           JP11           JP12             JP20

    None      pins 1 & 2     pins 1 & 2      pins 1 & 2         Open
                closed         closed         closed

    256KB     pins 2 & 3     pins 2 & 3      pins 1 & 2     pins 1 & 2, 3
    (A)         closed         closed         closed         & 4 closed

    256KB        Open           Open           Open             Open
    (B)

    512KB     pins 1 & 2     pins 1 & 2      pins 2 & 3     pins 1 & 2, 3
    (A)         closed         closed         closed         & 4 closed

    512KB        Open           Open           Open             Open
    (B)

       CACHE VOLTAGE CONFIGURATION

       Voltage               JP8

     Mixed mode       pins 1 & 2 closed

        3.3v          pins 2 & 3 closed

                       CPU CLOCK SPEED CONFIGURATION

      Speed              JP6               JP7                JP18

      50MHz           pins 2 & 3        pins 2 & 3      pins 1 & 2 closed
                       closed             closed

      60MHz           pins 1 & 2        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

      66MHz           pins 2 & 3        pins 1 & 2      pins 2 & 3 closed
                       closed             closed

                CPU CLOCK RATIO CONFIGURATION

   Core/bus ratio            JP14                 JP15

         1.5           pins 1 & 2 closed   pins 1 & 2 closed

          2            pins 2 & 3 closed   pins 1 & 2 closed

         2.5           pins 2 & 3 closed   pins 2 & 3 closed

          3            pins 1 & 2 closed   pins 2 & 3 closed

        CPU VOLTAGE CONFIGURATION

       Voltage               JP17

        3.3v          pins 1 & 2 closed

        3.4v          pins 2 & 3 closed

        3.5v          pins 4 & 5 closed

                             VRM CONFIGURATION

             CPU type                                CN7

               P54C                  pins 4 & 5, 6 & 7, 19 & 20, 21 & 22
                                                   closed

               P55C                             VRM installed

  Note: Pin 1 is shown for clarification purposes only.

