
VEXTREC TECHNOLOGY, INC.

GMB-P56IAX (VER. 1.02)

Device Type          Mainboard
Processor            CX 6X86/AM K5/Pentium/Pentium MMX
Processor Speed      75/90/100/120/133/150/166/200MHz
Chip Set             Intel 430VX
Maximum Onboard      128MB (EDO & SDRAM supported)
Memory
Cache                256/512KB
BIOS                 AMI/Award
I/O Options          32-bit PCI slots (4), floppy drive interface, IDE
                     interface (2), parallel port, PS/2 mouse port, serial
                     ports (2), cache slot, IR connector, USB connector (2)
Dimensions           305mm x 210mm

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  ATX power supply           ATX       IR connector               J10

  Reset switch                J1       USB connector 1            J11

  Green PC connector          J2       USB connector 2            J12

  Suspend LED                 J3       Serial port 2              J14

  Speaker                     J4       Parallel port              J15

  IDE interface LED           J5       PS/2 mouse port            J16

  Power LED & keylock         J6       Serial port 1              J18

  IDE interface 2             J7       Power switch               JP4

  IDE interface 1             J8       32-bit PCI slots         PC1 - PC4

  Floppy drive interface      J9       Cache slot                 SL1

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     CMOS memory normal operation            JP1              Open

      CMOS memory clear                       JP1             Closed

      Flash BIOS voltage select 12v           JP2           Pins 1 & 2
                                                              closed

      Flash BIOS voltage select 5v            JP2           Pins 2 & 3
                                                              closed

                         DRAM CONFIGURATION

      Size           Bank 0            Bank 1           Bank 2

      4MB         (2) 512KB x 32        None             None

      8MB         (2) 512KB x 32   (2) 512KB x 32        None

      8MB         (2) 1MB x 32          None             None

      16MB        (2) 1MB x 32      (2) 1MB x 32         None

      16MB        (2) 2MB x 32          None             None

      24MB        (2) 1MB x 32      (2) 1MB x 32     (1) 1MB x 64

      24MB        (2) 2MB x 32      (2) 1MB x 32         None

      32MB        (2) 2MB x 32      (2) 2MB x 32         None

      32MB        (2) 4MB x 32          None             None

      40MB        (2) 2MB x 32      (2) 2MB x 32     (1) 1MB x 64

      40MB        (2) 4MB x 32      (2) 1MB x 32         None

      48MB        (2) 2MB x 32      (2) 2MB x 32     (1) 2MB x 64

      48MB        (2) 4MB x 32      (2) 2MB x 32         None

      64MB        (2) 4MB x 32      (2) 4MB x 32         None

      64MB        (2) 8MB x 32          None             None

      72MB        (2) 4MB x 32      (2) 4MB x 32     (1) 1MB x 64

      72MB        (2) 8MB x 32      (2) 1MB x 32         None

      80MB        (2) 4MB x 32      (2) 4MB x 32     (1) 2MB x 64

      80MB        (2) 8MB x 32      (2) 2MB x 32         None

      96MB        (2) 4MB x 32      (2) 4MB x 32     (1) 4MB x 64

      96MB        (2) 8MB x 32      (2) 4MB x 32         None

     128MB        (2) 8MB x 32      (2) 8MB x 32         None

  Note: Board accepts EDO and SDRAM.

              DRAM JUMPER CONFIGURATION

  Voltage           S7                   S8

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

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

                            CACHE CONFIGURATION

  256KB onboard, upgradeable to 512KB by inserting a cache module in SL1.

                       CPU SPEED SELECTION (CX 6X86)

  Speed     Clock    Multiplier   JP11   JP12     S1       S2       S3
           speed

  120MHz   50MHz        2x        2 &    1 &    Closed   Closed    Open
                                   3      2

  133MHz   55MHz        2x        2 &    1 &     Open    Closed    Open
                                   3      2

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

  166MHz   66MHz        2x        2 &    1 &     Open     Open     Open
                                   3      2

  200MHz   66MHz       2.5x       2 &    1 &     Open     Open    Closed
                                   3      2

  Note: Numbers designate pins that should be closed.

                        CPU SPEED SELECTION (AM K5)

  Speed     Clock     Multiplier   JP11   JP12     S1        S2      S3
            speed

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

  90MHz     60MHz       1.5x        1 &    1 &    Closed    Open    Open
                                    2      2

  100MHz    66MHz       1.5x        1 &    1 &    Open      Open    Open
                                    2      2

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

  133MHz    66MHz        2x         1 &    1 &    Open      Open    Open
                                    2      2

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

  166MHz    66MHz       2.5x        2 &    2 &    Open      Open    Open
                                    3      3

  Note: Numbers designate pins that should be closed.

                       CPU SPEED SELECTION (PENTIUM)

  Speed     Clock     Multiplier   JP11   JP12     S1        S2      S3
            speed

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

  90MHz     60MHz       1.5x        1 &    1 &    Closed    Open    Open
                                    2      2

  100MHz    66MHz       1.5x        1 &    1 &    Open      Open    Open
                                    2      2

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

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

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

  166MHz    66MHz       2.5x        2 &    2 &    Open      Open    Open
                                    3      3

  200MHz    66MHz        3x         1 &    2 &    Open      Open    Open
                                    2      3

  Note: Numbers designate pins that should be closed.

                     CPU SPEED SELECTION (PENTIUM MMX)

  Speed      Clock     Multiplier   JP11    JP12     S1      S2      S3
             speed

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

  166MHz     66MHz       2.5x        2 &    2 &     Open     Open   Open
                                     3       3

  200MHz     66MHz        3x         1 &    2 &     Open     Open   Open
                                     2       3

  Note: Numbers designate pins that should be closed.

          CPU VOLTAGE SELECTION (SINGLE)

  Voltage     JP8        S4        S5        S6

   3.4v      Closed    Closed    Closed    Closed

   3.5v       Open     Closed    Closed    Closed

                       CPU VOLTAGE SELECTION (DUAL)

  Voltage (core)       JP8            S4            S5            S6

      2.8v            Closed         Open          Open          Open

