EPOX COMPUTER CO., LTD.

P55-IT

Processor             Pentium
Processor Speed       75/90/100/120/133/150/166MHz
Chip Set              Intel
Video Chip Set        None
Maximum Onboard       128MB (EDO supported)
Memory
Maximum Video Memory  None
Cache                 256/512KB
BIOS                  Award
Dimensions            330mm x 218mm
I/O Options           32-bit PCI slots (4), floppy drive interface, green
                      PC connector, IDE interfaces (2), parallel port,
                      PS/2 mouse port, PS/2 mouse interface, serial ports
                      (2), cache slot, VRM connector
NPU Options           None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port 2              CN1       Turbo switch                J4

  Serial port 1              CN2       Turbo LED                   J5

  Parallel port              CN3       Green PC LED                J6

  Floppy drive interface     CN4       Chassis fan power           J7

  IDE interface 2            CN5       PS/2 mouse interface       J10

  IDE interface 1            CN6       IDE interface LED          JP5

  PS/2 mouse port            CN7       Green PC connector         JP14

  Power LED & keylock         J1       32-bit PCI slots         PC1 – PC4

  Speaker                     J2       Cache slot                 SL1

  Reset switch                J3       VRM connector              VRM

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

  »   Factory configured - do not           J23          Unidentified
      alter

  »   On board I/O enabled                  J24              Open

      On board I/O disabled                 J24             Closed

      IDE 1 IRQ14 enabled                   JP2        Pins 1 & 2 closed

      IDE 1 IRQ14 disabled                  JP2        Pins 2 & 3 closed

      IDE 2 IRQ15 enabled                   JP3        Pins 1 & 2 closed

      IDE 2 IRQ15 disabled                  JP3        Pins 2 & 3 closed

  »   Flash BIOS voltage select 5v          JP6        Pins 1 & 2 closed

      Flash BIOS voltage select 12v         JP6        Pins 2 & 3 closed

  »   Factory configured - do not          JP12          Unidentified
      alter

                            SIMM CONFIGURATION

          Size                    Bank 0                   Bank 1

           8MB                 (2) 1M x 36                  None

          16MB                 (2) 2M x 36                  None

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

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

          32MB                 (2) 4M x 36                  None

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

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

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

          64MB                 (2) 8M x 36                  None

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

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

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

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

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

            Note: Board accepts EDO memory. Board also accepts x 32
            SIMMs.

                            CACHE CONFIGURATION

      Size          Bank 0            Bank 1                  TAG

   256KB (A)         None           256KB module      (1) 8K/16K/32K x 8
                                     installed

   256KB (B)      (2) 32K x 32     Not installed      (1) 8K/16K/32K x 8

   512KB (A)      (2) 64K x 32     Not installed        (1) 16K/32K x 8

   512KB (B)         None           512KB module      (1) 8K/16K/32K x 8
                                     installed

        CACHE JUMPER CONFIGURATION

        Size                 JP10

      256KB (A)       Pins 1 & 2 closed

      256KB (B)       Pins 1 & 2 closed

      512KB (A)       Pins 2 & 3 closed

      512KB (B)       Pins 2 & 3 closed

                            CPU SPEED SELECTION

    CPU      Clock    Multiplier    J25   JP7    JP9     JPS1      JPS2
  speed     speed

  75MHz     50MHz        1.5x       1 &    2 &    2 &    Open      Open
                                     2     3      3

  90MHz     60MHz        1.5x       2 &    2 &    2 &   Closed     Open
                                     3     3      3

  100MHz    66MHz        1.5x       2 &    2 &    2 &   Closed    Closed
                                     3     3      3

  120MHz    60MHz         2x        2 &    1 &    2 &   Closed     Open
                                     3     2      3

  133MHz    66MHz         2x        2 &    1 &    2 &   Closed    Closed
                                     3     2      3

  150MHz    60MHz        2.5x       2 &    1 &    1 &   Closed     Open
                                     3     2      2

  166MHz    66MHz        2.5x       2 &    1 &    1 &   Closed    Closed
                                     3     2      2

  Note: Pins designated should be in the closed position.

            CPU TYPE SELECTION

        Type                 JP1

        P54C          Pins 1 & 2 closed

        P55C          Pins 2 & 3 closed

                         KEYBOARD CLOCK SELECTION

          Setting                    JP15A                  JP15B

  »      Set by system AT      Pins 1 & 2 closed      Pins 1 & 2 closed
              CLOCK

       Clock rate – 12MHz      Pins 2 & 3 closed      Pins 2 & 3 closed