
J-MARK COMPUTER CORPORATION

J-TX98 R2

Device Type     Mainboard
Processor       CX 6X86/IBM 6X86/CX 686MX/IBM 6X86MX/AM K5/

                AM K6/Pentium/Pentium MMX
Processor Speed 75/90/100/120/133/150/166/180/200/233/266/300MHz
Chip Set        SIS 5598
Video Chip Set  SIS
Maximum Onboard 384MB (EDO & SDRAM supported) Unified Memory Architecture
Memory          (UMA)
Cache           256/512KB
BIOS            Unidentified
Dimensions      254mm x 218mm
I/O Options     32-bit PCI slots (3), floppy drive interface, IDE
                interfaces (2), parallel port, PS/2 mouse interface, serial
                ports (2), IR connector, USB connector, ATX power
                connector, VGA interface

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  ATX power connector        ATX       Floppy drive               CN3
                                       interface

  Turbo LED                   C1       Parallel port              CN4

  Reset switch                C2       IDE interface 2            CN5

  Speaker                     C3       IDE interface 1            CN6

  Turbo switch                C4       IR connector               IR1

  Power LED & keylock         C5       PS/2 mouse interface        J1

  IDE interface LED           C6       VGA interface               J5

  Soft off power supply       C7       CPU fan power               J9

  Serial port 1              CN1       32-bit PCI slots         PC1  PC3

  Serial port 2              CN2       USB connector              USB

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not          JP11          Unidentified
      alter

     Factory configured - do not          JP12          Unidentified
      alter

     Factory configured - do not          JP14          Unidentified
      alter

     CMOS memory normal operation         JP17        Pins 1 & 2 closed

      CMOS memory clear                    JP17        Pins 2 & 3 closed

      Flash BIOS voltage select 12v        JP19        Pins 1 & 2 closed

      Flash BIOS voltage select 5v         JP19        Pins 2 & 3 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

            Note: Board accepts EDO memory.

             DIMM CONFIGURATION

     Size          Bank 1        Bank 2

      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

           DIMM CONFIGURATION (CONT)

      Size          Bank 1          Bank 2

      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

     256KB        (1) 32K x 64   (1) 32K x 8

     512KB        (1) 64K x 64   (1) 32K x 8

                        CPU SPEED SELECTION (CX 6X86)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  120MHz   50MHz       2x        On      On      On      On     Off     Off

  133MHz   55MHz       2x        On      On      Off     On     Off     Off

  150MHz   60MHz       2x        Off     On      On      On     Off     Off

  166MHz   66MHz       2x        On      Off     On      On     Off     Off

                        CPU SPEED SELECTION (IBM 6X86)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  120MHz   50MHz       2x        On      On      On      On     Off     Off

  133MHz   55MHz       2x        On      On      Off     On     Off     Off

  150MHz   60MHz       2x        Off     On      On      On     Off     Off

  166MHz   66MHz       2x        On      Off     On      On     Off     Off

                       CPU SPEED SELECTION (CX 6X86MX)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  166MHz   60MHz      2.5x       Off     On      On      On      On     Off

  166MHz   66MHz      2.5x       On      Off     On      On      On     Off

  233MHz   66MHz       3x        On      Off     On     Off      On     Off

                       CPU SPEED SELECTION (IBM 6X86MX)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  166MHz   60MHz      2.5x       Off     On      On      On      On     Off

  166MHz   66MHz      2.5x       On      Off     On      On      On     Off

  233MHz   66MHz       3x        On      Off     On     Off      On     Off

                         CPU SPEED SELECTION (IDT C6)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  150MHz   50MHz       3x        On      On      On     Off      On     Off

  180MHz   60MHz       3x        Off     On      On     Off      On     Off

  200MHz   66MHz       3x        On      Off     On     Off      On     Off

                         CPU SPEED SELECTION (AM K5)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  75MHz    50MHz      1.5x       On      On      On     Off     Off     Off

  90MHz    60MHz      1.5x       Off     On      On     Off     Off     Off

  100MHz   66MHz      1.5x       On      Off     On     Off     Off     Off

  133MHz   66MHz      1.5x       On      Off     On     Off     Off     Off

  166MHz   66MHz      2.5x       On      Off     On      On      On     Off

                         CPU SPEED SELECTION (AM K6)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  166MHz   66MHz      2.5x       On      Off     On      On      On     Off

  200MHz   66MHz       3x        On      Off     On     Off      On     Off

  233MHz   66MHz      3.5x       On      Off     On     Off     Off     Off

  266MHz   66MHz       4x        On      Off     On      On     Off      On

  300MHz   66MHz      4.5x       On      Off     On      On      On      On

                         CPU SPEED SELECTION (INTEL)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  75MHz    50MHz      1.5x       On      On      On     Off     Off     Off

  90MHz    60MHz      1.5x       Off     On      On     Off     Off     Off

  100MHz   66MHz      1.5x       On      Off     On     Off     Off     Off

  120MHz   60MHz       2x        Off     On      On      On     Off     Off

  133MHz   66MHz       2x        On      Off     On      On     Off     Off

  150MHz   60MHz      2.5x       Off     On      On      On      On     Off

  166MHz   66MHz      2.5x       On      Off     On      On      On     Off

  200MHz   66MHz       3x        On      Off     On     Off      On     Off

                       CPU SPEED SELECTION (INTEL MMX)

   CPU     Clock   Multiplier   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6
  speed    speed

  166MHz   66MHz      2.5x       On      Off     On      On      On     Off

  200MHz   66MHz       3x        On      Off     On     Off      On     Off

  233MHz   66MHz      3.5x       On      Off     On     Off     Off     Off

                           CPU VOLTAGE SELECTION

   Voltage     JP15/pins 1     JP15/pins 3    JP15/pins 5   JP15/pins 7 &
                   & 2            & 4            & 6              8

    2.2v          Open           Closed          Open           Open

    2.8v          Open            Open           Open          Closed

    2.9v         Closed           Open           Open          Closed

    3.2v          Open            Open          Closed         Closed

    3.45v         Open           Closed         Closed         Closed

    3.52v        Closed          Closed         Closed         Closed

                         ON BOARD VIDEO SELECTION

      Setting             JP1                JP2               JP10

      Enabled          Pins 1 & 2         Pins 1 & 2        Pins 2 & 3
                         closed            closed             closed

     Disabled          Pins 2 & 3         Pins 2 & 3        Pins 1 & 2
                         closed            closed             closed

