
EFA CORPORATION

P55TPIO-B/P55TSPIO-B

Processor            CX M1/Pentium
Processor Speed      75/90/100/120/133/150/166/200MHz
Chip Set             Intel
Video Chip Set       None
Maximum Onboard      128MB
Memory
Maximum Video Memory None
Cache                256/512KB
BIOS                 Award
Dimensions           290mm x 220mm
I/O Options          32-bit PCI slots (3), floppy drive interface, green PC
                     connector, IDE interfaces (2), parallel port, serial
                     ports (2), audio bus slot, VRM connector
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port 2               J2       IDE interface LED          J14

  Serial port 1               J3       Green PC connector         J15

  Floppy drive interface      J6       Turbo LED                  J16

  Parallel port               J7       Turbo switch               J17

  IDE interface 2             J8       Reset switch               J18

  IDE interface 1             J9       32-bit PCI slots         PC1 - PC3

  Speaker                    J12       Audio bus slot             SL1

  Power LED & keylock        J13       VRM connector              VRM

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Sound interface enabled                 JP2              Open

      Sound interface disabled                JP2             Closed

     Flash BIOS voltage select 5v            JP5           Pins 1 & 2
                                                              closed

      Flash BIOS voltage select 12v           JP5           Pins 2 & 3
                                                              closed

     CMOS memory normal operation            JP12             Open

      CMOS memory clear                       JP12            Closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       4MB        (2) 512K x 36         None

       8MB         (2) 1M x 36          None

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

      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

      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

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

            DRAM CONFIGURATION (CONT)

      Size            Bank 0           Bank 1

      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

      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 also accepts x 32 SIMMs.

                            CACHE CONFIGURATION

       Size              Bank 0            Bank 1              TAG

       256KB          (2) 32K x 32          None         (1) 16K/32K x 8

       512KB          (2) 32K x 32      (2) 32K x 32     (1) 16K/32K x 8

  Note: The location of the TAG is unidentified.

                            CPU SPEED SELECTION

      Speed              JP3                JP4               JP11

      75MHz           Pins 2 & 3         Pins 2 & 3         Pins 1 & 2
                        closed            closed             closed

      90MHz           Pins 2 & 3         Pins 1 & 2         Pins 2 & 3
                        closed            closed             closed

      100MHz          Pins 1 & 2         Pins 2 & 3         Pins 2 & 3
                        closed            closed             closed

      120MHz          Pins 2 & 3         Pins 1 & 2         Pins 2 & 3
                        closed            closed             closed

      133MHz          Pins 1 & 2         Pins 2 & 3         Pins 2 & 3
                        closed            closed             closed

      150MHz          Pins 2 & 3         Pins 2 & 3         Pins 1 & 2
                        closed            closed             closed

      166MHz          Pins 1 & 2         Pins 2 & 3         Pins 2 & 3
                        closed            closed             closed

      180MHz          Pins 2 & 3         Pins 1 & 2         Pins 2 & 3
                        closed            closed             closed

      200MHz          Pins 1 & 2         Pins 2 & 3         Pins 2 & 3
                        closed            closed             closed

               CPU MULTIPLIER SELECTION (CYRIX)

     Multiplier              JP7                  JP8

         1x            Pins 2 & 3 closed   Pins 2 & 3 closed

         2x            Pins 2 & 3 closed   Pins 1 & 2 closed

         3x            Pins 1 & 2 closed   Pins 2 & 3 closed

         4x            Pins 1 & 2 closed   Pins 1 & 2 closed

               CPU MULTIPLIER SELECTION (INTEL)

     Multiplier              JP7                  JP8

        1.5x           Pins 1 & 2 closed   Pins 1 & 2 closed

         2x            Pins 2 & 3 closed   Pins 1 & 2 closed

        2.5x           Pins 2 & 3 closed   Pins 2 & 3 closed

         3x            Pins 1 & 2 closed   Pins 2 & 3 closed

          CPU VOLTAGE SELECTION

       Voltage               JP10

     3.3v (STD)       Pins 1 & 2 closed

      3.4v (VR)       Pins 2 & 3 closed

     3.5v (VRE)       Pins 4 & 5 closed

      3.3v/2.5v         VRM installed

                               VRM SELECTION

               Type                                  VRM

             All P54C                Pins 17 & 19, 18 & 20, 21 & 23, 22 &
                                                  24 closed

               P55C                             VRM installed

