
EPOX COMPUTER CO., LTD.

P55-TXL

Processor          CX M1/AM K5/Pentium
Processor Speed    90/100/120/133/150/166/180/200/225MHz
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

  Floppy drive             CN6        Green PC LED         JP14/pins 18 &
  interface                                                     19

  IDE interface 2          CN7        Turbo LED            JP14/pins 21 &
                                                                22

  IDE interface 1          CN8        IDE interface LED    JP14/pins 24 &
                                                                25

  IR connector             J4         32-bit PCI slots       PC1  PC4

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Keyboard power on function            JP2        Pins 1 & 2 closed
      enabled

      Keyboard power on function            JP2        Pins 2 & 3 closed
      disabled

     Factory configured - do not           JP6          Unidentified
      alter

     CMOS memory normal operation          JP8        Pins 1 & 2 closed

      CMOS memory clear                     JP8        Pins 2 & 3 closed

                         DIMM/DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     8MB        (2) 1M x 36       None           None          None

     8MB           None       (2) 1M x 36        None          None

     8MB           None           None       (1) 1M x 64       None

     16MB       (2) 2M x 36       None           None          None

     16MB          None           None       (1) 2M x 64       None

     16MB       (2) 1M x 36   (2) 1M x 36        None          None

     16MB          None       (2) 1M x 36        None       (1) 1M x 64

     16MB          None           None       (1) 1M x 64    (1) 1M x 64

     24MB          None       (2) 2M x 36        None       (1) 1M x 64

     32MB       (2) 4M x 36       None           None          None

     32MB          None           None       (1) 4M x 64       None

     32MB          None       (2) 2M x 36        None       (1) 2M x 64

     40MB       (2) 4M x 36   (2) 1M x 36        None          None

     48MB       (2) 4M x 36   (2) 2M x 36        None          None

     48MB          None       (2) 4M x 36        None       (1) 2M x 64

     64MB       (2) 8M x 36       None           None          None

     64MB          None           None           None       (1) 8M x 64

     64MB       (2) 4M x 36   (2) 4M x 36        None          None

     64MB          None       (2) 4M x 36        None       (1) 4M x 64

     64MB          None           None       (1) 4M x 64    (1) 4M x 64

                      DIMM/DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     72MB        (2) 8M x 36   (2) 1M x 36        None           None

     72MB           None       (2) 8M x 36        None       (1) 1M x 64

     80MB           None       (2) 2M x 36        None       (1) 8M x 64

     80MB        (2) 8M x 36   (2) 2M x 36        None           None

     96MB           None       (2) 4M x 36        None       (1) 8M x 64

     96MB        (2) 8M x 36   (2) 4M x 36        None           None

     128MB          None       (2) 8M x 36        None       (1) 8M x 64

     128MB       (2) 8M x 36   (2) 8M x 36        None           None

     128MB       (2) 16M x 36      None           None           None

     256MB       (2) 16M x 36  (2) 16M x 36       None           None

  Note: Board accepts EDO memory. Banks 0 & 1 and 2 & 3 are
  interchangeable.

                        DIMM 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

                        CPU SPEED SELECTION (CYRIX)

    CPU speed       Clock speed         Multiplier             JP4

     133MHz            55MHz                2x             Pins 21 & 22
                                                              closed

     150MHz            60MHz                2x              Pins 5 & 6
                                                              closed

     166MHz            66MHz                2x              Pins 7 & 8
                                                              closed

     200MHz            75MHz                2x             Pins 19 & 20
                                                              closed

                         CPU SPEED SELECTION (AMD)

    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 VOLTAGE SELECTION

         Voltage                    J9                      J10

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

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

