
EPOX COMPUTER CO., LTD.

P55-VA

Processor           CX M1/AM K5/Pentium
Processor Speed     75/90/100/120/133/150/166/180/200MHz
Chip Set            Intel
Video Chip Set      None
Maximum Onboard     128MB (EDO supported)
Memory
Maximum Video       None
Memory
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, serial ports (2), cache slot, IR connector,
                    USB connector, ATX power connector
NPU Options         None

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                 Location

  ATX power                ATX        Power on connector         J3
  connector

  PS/2 mouse port          CN1        Power LED &           J4 pins 1 - 5
                                      keylock

  Serial port 1            CN3        Speaker                J4 pins 7 -
                                                                 10

  Parallel port            CN4        Reset switch           J4 pins 12 &
                                                                 13

  Serial port 2            CN5        Turbo LED              J4 pins 15 &
                                                                 16

  USB connector            CN6        Green PC connector     J4 pins 18 &
                                                                 19

  Floppy drive             CN7        Green PC LED           J4 pins 21 &
  interface                                                      22

  IDE interface 1          CN8        IDE interface LED      J4 pins 24 &
                                                                 25

  IDE interface 2          CN9        32-bit PCI slots        PC1 - PC4

  Chassis fan power         J1        Cache slot                 SL1

  IR connector              J2

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Flash BIOS voltage select 12v           JP1           Pins 2 & 3
                                                              closed

      Flash BIOS voltage select 5v            JP1           Pins 1 & 2
                                                              closed

     CMOS memory normal operation            JP5           Pins 1 & 2
                                                              closed

      CMOS memory clear                       JP5           Pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2         Bank 3

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

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

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

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

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

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

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

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

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

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

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

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

     32MB       (2) 1M x 36    (2) 1M x 36    (1) 1M x 64    (1) 1M x 64

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

     40MB       (2) 4M x 36        None       (1) 1M x 64       None

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

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

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

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

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

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

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1        Bank 2         Bank 3

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

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

     72MB       (2) 2M x 36    (2) 2M x 36    (1) 1M x 64    (1) 4M x 64

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

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

     80MB       (2) 4M x 36    (2) 4M x 36    (1) 1M x 64    (1) 1M x 64

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

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

     96MB       (2) 2M x 36    (2) 2M x 36    (1) 4M x 64    (1) 4M x 64

     104MB      (2) 4M x 36    (2) 4M x 36    (1) 1M x 64    (1) 4M x 64

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

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

     128MB      (2) 4M x 36    (2) 4M x 36    (1) 4M x 64    (1) 4M x 64

  Note: Board accepts EDO memory. Banks are interchangeable.

                        CACHE CONFIGURATION

      Size            Bank 0            SL1              TAG

      256KB        (2) 32K x 32    Not installed    Unidentified

      512KB        (2) 32K x 32      Installed      Unidentified

      512KB        (2) 64K x 32    Not installed    Unidentified

                        CPU SPEED SELECTION (CYRIX)

    CPU speed       Clock speed         Multiplier             JP8

     120MHz            50MHz                2x             Pins 10 & 23
                                                              closed

     133MHz            55MHz                2x             Pins 13 & 26
                                                              closed

     150MHz            60MHz                2x              Pins 4 & 17
                                                              closed

     166MHz            66MHz                2x              Pins 5 & 18
                                                              closed

     200MHz            75MHz                2x             Pins 12 & 25
                                                              closed

                        CPU SPEED SELECTION (INTEL)

    CPU speed       Clock speed         Multiplier             JP8

      75MHz            50MHz               1.5x             Pins 1 & 14
                                                              closed

      90MHz            60MHz               1.5x             Pins 2 & 15
                                                              closed

     100MHz            66MHz               1.5x             Pins 3 & 16
                                                              closed

     120MHz            60MHz                2x              Pins 4 & 17
                                                              closed

     133MHz            66MHz                2x              Pins 5 & 18
                                                              closed

     150MHz            60MHz               2.5x             Pins 6 & 19
                                                              closed

     166MHz            66MHz               2.5x             Pins 7 & 20
                                                              closed

     180MHz            60MHz                3x              Pins 8 & 21
                                                              closed

     200MHz            66MHz                3x              Pins 9 & 22
                                                              closed

                            CPU TYPE SELECTION

       Type               JP3A              JP3B               JP3C

       CX M1           Pins 1 & 2         Pins 1 & 2        Pins 1 & 2
                         closed            closed             closed

       AM K5           Pins 1 & 2         Pins 1 & 2        Pins 1 & 2
                         closed            closed             closed

     P54C/CTB          Pins 1 & 2         Pins 1 & 2        Pins 1 & 2
                         closed            closed             closed

       P55C            Pins 2 & 3         Pins 2 & 3        Pins 2 & 3
                         closed            closed             closed

                           CPU VOLTAGE SELECTION

               Voltage                                 JP4

                   2.5v                         Pins 1 & 2 closed

                  2.8v                         Pins 2 & 3 closed

                   2.9v                               Open

                       MISCELLANEOUS TECHNICAL NOTE

            If 200MHz Cyrix chip is installed, do not install the COAST
            module. Also, do not install a PCI 2.0 SCSI card. Either of
            the above cases will cause the mainboard to lock up. A PCI
            2.1 SCSI card may be installed with no problems.

