
EPOX COMPUTER CO., LTD.

P55-TX

Processor         CX 6X86/AM K5/AM K6/Pentium
Processor Speed   90/100/120/133/150/166/180/200/225/233MHz
Chip Set          Intel
Video Chip Set    None
Maximum Onboard   256MB (EDO supported)
Memory
Maximum Video     None
Memory
Cache             512KB
BIOS              Award
Dimensions        305mm x 244mm
I/O Options       32-bit PCI slots (4), floppy drive interface, green PC
                  connector, IDE interfaces (2), parallel port, PS/2 mouse
                  port, serial ports (2), IR connector, USB connector, ATX
                  power connector
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                Location

  ATX power                ATX        Chassis fan power         JP1
  connector

  USB connector            CN1        Soft off power            JP9
                                      supply

  Serial port 2            CN2        Power LED &         JP14/pins 1  5
                                      keylock

  Parallel port            CN3        Speaker              JP14/pins 7 -
                                                                10

  PS/2 mouse port          CN4        Reset switch         JP14/pins 12 &
                                                                13

  Serial port 1            CN5        Green PC             JP14/pins 15 &
                                      connector                 16

  IR connector             J4         Green PC LED         JP14/pins 18 &
                                                                19

  IDE interface 1          J5         Turbo LED            JP14/pins 20 &
                                                                21

  IDE interface 2          J6         IDE interface LED    JP14/pins 23 &
                                                                24

  Floppy drive             J7         32-bit PCI bus         PC1  PC4
  interface                           slots

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Keyboard power on enabled             JP2        Pins 1 & 2 closed

      Keyboard power on disabled            JP2        Pins 2 & 3 closed

     Factory configured - do not           JP6          Unidentified
      alter

     CMOS memory normal operation          JP8        Pins 1 & 2 closed

      CMOS memory clear                     JP8        Pins 2 & 3 closed

              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

     128MB        (2) 16M x 36       None

     136MB        (2) 16M x 36   (2) 1M x 36

     144MB        (2) 16M x 36   (2) 2M x 36

     160MB        (2) 16M x 36   (2) 4M x 36

     192MB        (2) 16M x 36   (2) 8M x 36

     256MB        (2) 16M x 36   (2) 16M x 36

  Note: Board accepts EDO memory.

             DIMM CONFIGURATION

     Size          Bank 0        Bank 1

      8MB        (1) 1M x 64      None

     16MB        (1) 2M x 64      None

     16MB        (1) 1M x 64   (1) 1M x 64

     24MB        (1) 2M x 64   (1) 1M x 64

     32MB        (1) 4M x 64      None

     32MB        (1) 2M x 64   (1) 2M x 64

     40MB        (1) 4M x 64   (1) 1M x 64

     48MB        (1) 4M x 64   (1) 2M x 64

     64MB        (1) 8M x 64      None

     64MB        (1) 4M x 64   (1) 4M x 64

     72MB        (1) 8M x 64   (1) 1M x 64

     80MB        (1) 8M x 64   (1) 2M x 64

     96MB        (1) 8M x 64   (1) 4M x 64

     128MB       (1) 8M x 64   (1) 8M x 64

                      DIMM/SIMM VOLTAGE CONFIGURATION

         Voltage                    JP7A                    JP7B

            3.3v            Pins 2 & 3 closed        Pins 2 & 3 closed

              5v             Pins 1 & 2 closed        Pins 1 & 2 closed

                CACHE CONFIGURATION

      Size            Bank 0            TAG

      512KB        (2) 64K x 32     Unidentified

  Note: The location of the TAG is unidentified.

                       CPU SPEED SELECTION (CX 6X86)

    CPU speed       Clock speed         Multiplier             JP4

     133MHz            66MHz                2x             Pins 23 & 24
                                                              closed

     150MHz            60MHz                2x              Pins 5 & 6
                                                              closed

     166MHz            66MHz                2x              Pins 7 & 8
                                                              closed

     200MHz            66MHz                2x             Pins 25 & 26
                                                              closed

                      CPU SPEED SELECTION (AM K5/K6)

    CPU speed       Clock speed         Multiplier             JP4

      90MHz            60MHz               1.5x             Pins 1 & 2
                                                              closed

     100MHz            66MHz               1.5x             Pins 3 & 4
                                                              closed

     120MHz            60MHz                2x              Pins 5 & 6
                                                              closed

     133MHz            66MHz                2x              Pins 7 & 8
                                                              closed

     150MHz            60MHz               2.5x             Pins 9 & 10
                                                              closed

     166MHz            66MHz               2.5x            Pins 11 & 12
                                                              closed

     180MHz            60MHz                3x             Pins 13 & 14
                                                              closed

     200MHz            66MHz                3x             Pins 15 & 16
                                                              closed

     225MHz            75MHz               3.5x            Pins 17 & 18
                                                              closed

                        CPU SPEED SELECTION (INTEL)

    CPU speed       Clock speed         Multiplier             JP4

      90MHz            60MHz               1.5x             Pins 1 & 2
                                                              closed

     100MHz            66MHz               1.5x             Pins 3 & 4
                                                              closed

     120MHz            60MHz                2x              Pins 5 & 6
                                                              closed

     133MHz            66MHz                2x              Pins 7 & 8
                                                              closed

     150MHz            60MHz               2.5x             Pins 9 & 10
                                                              closed

     166MHz            66MHz               2.5x            Pins 11 & 12
                                                              closed

     180MHz            60MHz                3x             Pins 13 & 14
                                                              closed

     200MHz            66MHz                3x             Pins 15 & 16
                                                              closed

     225MHz            75MHz               3.5x            Pins 17 & 18
                                                              closed

                      CPU VOLTAGE SELECTION (SINGLE)

                Voltage                                J16

                   3.3v                         Pins 1 & 2 closed

                   3.45v                        Pins 2 & 3 closed

                  3.52v                        Pins 3 & 4 closed

                       CPU VOLTAGE SELECTION (DUAL)

       Voltage            V core             J16               J18

           3.3v            2.5v           Pins 1 & 2        Pins 1 & 2
                                           closed             closed

           3.3v            2.8v           Pins 1 & 2        Pins 2 & 3
                                           closed             closed

           3.3v            2.9v           Pins 1 & 2           Open
                                           closed

          3.45v            2.5v           Pins 2 & 3        Pins 1 & 2
                                           closed             closed

          3.45v            2.8v           Pins 2 & 3        Pins 2 & 3
                                           closed             closed

          3.45v            2.9v           Pins 2 & 3           Open
                                           closed

          3.52v            2.5v           Pins 3 & 4        Pins 1 & 2
                                           closed             closed

         3.52v            2.8v           Pins 3 & 4        Pins 2 & 3
                                           closed             closed

          3.52v            2.9v           Pins 3 & 4           Open
                                           closed

                           FLASH BIOS SELECTION

         Setting                    J9                      J10

             5v             Pins 2 & 3 closed       Pins 2 & 3 closed

             12v             Pins 1 & 2 closed       Pins 1 & 2 closed

