
J-MARK COMPUTER CORPORATION

J-5TXBR2

Device Type      Mainboard
Processor        CX 6X86/IBM 6X86/CX 686MX/IBM 6X86MX/AM K5/AM K6/Pentium
Processor Speed  75/90/100/120/133/150/166/200/233/266/300MHz
Chip Set         Intel
Video Chip Set   None
Maximum Onboard  256MB (EDO & SDRAM supported)
Memory
Maximum Video    None
Memory
Cache            512KB
BIOS             Award
Dimensions       220mm x 220mm
I/O Options      32-bit PCI slots (4), floppy drive interface, green PC
                 connector, IDE interfaces (2), parallel port, PS/2 mouse
                 interface, serial ports (2), IR connector, USB connectors
                 (2), ATX power connector
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  ATX power                ATX         USB connector 1          J17
  connector

  IDE interface LED         C1         USB connector 2          J18

  Green PC connector        C2         CPU fan power            J19

  PS/2 mouse                J1         Soft off power           J20
  interface                            supply

  Serial port 2             J6         Speaker             J22/pins 1 - 4

  Serial port 1             J7         Reset switch        J22/pins 5 & 6

  Floppy drive              J8         Turbo LED           J22/pins 7 & 8
  interface

  IDE interface 1           J9         Power LED &          J22/pins 9 -
                                       keylock                   13

  Parallel port            J10         Turbo switch         J22/pins 14 -
                                                                 16

  IDE interface 2          J11         32-bit PCI slots      PC1  PC4

  IR connector             J16

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Flash BIOS voltage select 12v           JP3           Pins 1 & 2
                                                              closed

      Flash BIOS voltage select 5v            JP3           Pins 2 & 3
                                                              closed

     CMOS memory normal operation            JP4           Pins 2 & 3
                                                              closed

      CMOS memory clear                       JP4           Pins 3 & 4
                                                              closed

              SIMM CONFIGURATION

         Size                  Bank 0

          8MB                (2) 1M x 36

         16MB                (2) 2M x 36

         32MB                (2) 4M x 36

         64MB                (2) 8M x 36

         128MB              (2) 16M x 36

         256MB              (2) 32M 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) 16M x 64        None

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

     136MB       (1) 16M x 64     (1) 1M x 64

     144MB       (1) 16M x 64     (1) 2M x 64

     160MB       (1) 16M x 64     (1) 4M x 64

     192MB       (1) 16M x 64     (1) 8M x 64

     256MB       (1) 16M x 64    (1) 16M x 64

            Note: Board accepts SDRAM memory.

              CACHE CONFIGURATION

      Size          Bank 0           TAG

     512KB        (1) 64K x 64   (1) 32K x 32

                       CPU SPEED SELECTION (CX 6X86)

    CPU speed       Clock speed         Multiplier             JP6

     120MHz            50MHz                2x             Pins 17 & 18
                                                              closed

     133MHz            55MHz                2x             Pins 19 & 20
                                                              closed

     150MHz            60MHz                2x             Pins 21 & 22
                                                              closed

     166MHz            66MHz                2x             Pins 23 & 24
                                                              closed

     200MHz            75MHz                2x             Pins 25 & 26
                                                              closed

                      CPU SPEED SELECTION (IBM 6X86)

    CPU speed       Clock speed         Multiplier             JP6

     120MHz            50MHz                2x             Pins 17 & 18
                                                              closed

     133MHz            55MHz                2x             Pins 19 & 20
                                                              closed

     150MHz            60MHz                2x             Pins 21 & 22
                                                              closed

     166MHz            66MHz                2x             Pins 23 & 24
                                                              closed

     200MHz            75MHz                2x             Pins 25 & 26
                                                              closed

                      CPU SPEED SELECTION (CX 6X86MX)

    CPU speed       Clock speed         Multiplier             JP6

     166MHz            66MHz               2.5x            Pins 11 & 12
                                                              closed

     200MHz            66MHz               2.5x            Pins 13 & 14
                                                              closed

     200MHz            75MHz                2x             Pins 25 & 26
                                                              closed

     233MHz            66MHz                3x             Pins 15 & 16
                                                              closed

                        CPU SPEED SELECTION (AM K5)

    CPU speed       Clock speed         Multiplier             JP6

      90MHz            60MHz               1.5x             Pins 3 & 4
                                                              closed

     100MHz            66MHz               1.5x             Pins 5 & 6
                                                              closed

     133MHz            66MHz               1.5x             Pins 5 & 6
                                                              closed

     166MHz            66MHz               2.5x            Pins 13 & 14
                                                              closed

                        CPU SPEED SELECTION (AM K6)

    CPU speed       Clock speed         Multiplier             JP6

     166MHz            66MHz               2.5x            Pins 13 & 14
                                                              closed

     200MHz            66MHz                3x             Pins 15 & 16
                                                              closed

     266MHz            66MHz                4x             Pins 27 & 28
                                                              closed

     300MHz            66MHz               4.5x            Pins 29 & 30
                                                              closed

                        CPU SPEED SELECTION (INTEL)

    CPU speed       Clock speed         Multiplier             JP6

      75MHz            50MHz               1.5x             Pins 1 & 2
                                                              closed

      90MHz            60MHz               1.5x             Pins 3 & 4
                                                              closed

     100MHz            66MHz               1.5x             Pins 5 & 6
                                                              closed

     120MHz            60MHz                2x              Pins 7 & 8
                                                              closed

     133MHz            66MHz                2x              Pins 9 & 10
                                                              closed

     150MHz            60MHz               2.5x            Pins 11 & 12
                                                              closed

     166MHz            66MHz               2.5x            Pins 13 & 14
                                                              closed

     200MHz            66MHz                3x             Pins 15 & 16
                                                              closed

                      CPU SPEED SELECTION (INTEL MMX)

    CPU speed       Clock speed         Multiplier             JP6

     166MHz            66MHz               2.5x            Pins 13 & 14
                                                              closed

     200MHz            66MHz                3x             Pins 15 & 16
                                                              closed

     233MHz            66MHz               3.5x             Pins 5 & 6
                                                              closed

                           CPU VOLTAGE SELECTION

   Voltage      JP7/pins 1 &   JP7/pins 3 &   JP7/pins 5 &   JP7/pins 7 &
                     2              4              6              8

     2.1v         Closed          Open           Open            Open

     2.8v          Open           Open           Open           Closed

     2.9v         Closed          Open           Open           Closed

     3.1v          Open           Open          Closed          Closed

     3.3v         Closed          Open          Closed          Closed

    3.45v          Open          Closed         Closed          Closed

     3.5v         Closed         Closed         Closed          Closed

