
J-MARK COMPUTER CORPORATION

J-5TXA, J-5TXA/L

Device Type       Mainboard
Processor         CX 6X86/IBM 6X86/CX 686MX/AM K5/AM K6/Pentium
Processor Speed   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        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 connectors (2), USB connectors
                  (2), ATX power connector
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  ATX power connector        ATX       PS/2 mouse port             J1

  Speaker                     C1       Parallel port               J3

  Reset switch                C2       Serial port 1               J4

  Turbo LED                   C3       USB connector 1             J5

  IDE interface LED           C4       USB connector 2            J5A

  Power LED & keylock         C5       Serial port 2               J6

  Turbo switch                C6       Floppy drive               J14
                                       interface

  Green PC connector          C7       IDE interface 2            J15

  Consumer IR connector      CIR1      IDE interface 1            J17

  CPU fan power              CPU       Soft off power supply      JP7

  IR connector               IR1       32-bit PCI slots         PC1  PC4

                        USER CONFIGURABLE SETTINGS

              Function                    Label            Position

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

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

      CMOS memory                          JP6           Unidentified

             SIMM CONFIGURATION

     Size          Bank 0        Bank 1

      8MB        (2) 1M x 36      None

     16MB        (2) 2M x 36      None

     16MB        (2) 1M x 36   (2) 1M x 36

     24MB        (2) 2M x 36   (2) 1M x 36

     32MB        (2) 4M x 36      None

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

     40MB        (2) 4M x 36   (2) 1M x 36

     48MB        (2) 4M x 36   (2) 2M x 36

     64MB        (2) 8M x 36      None

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

     72MB        (2) 8M x 36   (2) 1M x 36

     80MB        (2) 8M x 36   (2) 2M x 36

     96MB        (2) 8M x 36   (2) 4M x 36

     128MB       (2) 8M x 36   (2) 8M x 36

          SIMM CONFIGURATION (CONT)

      Size          Bank 0          Bank 1

     128MB        (2) 16M x 36       None

     136MB        (2) 16M x 36   (2) 1M x 36

     144MB        (2) 16M x 36   (2) 2M x 36

     160MB        (2) 16M x 36   (2) 4M x 36

     192MB        (2) 16M x 36   (2) 8M x 36

     256MB        (2) 16M x 36   (2) 16M x 36

  Note: Board accepts EDO memory.

               DIMM CONFIGURATION

      Size          Bank 2          Bank 3

      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             J16

     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             J16

     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             J16

     166MHz            60MHz               2.5x             Pins 9 & 10
                                                              closed

     200MHz            75MHz                2x             Pins 25 & 26
                                                              closed

     233MHz            66MHz                3x             Pins 13 & 14
                                                              closed

                        CPU SPEED SELECTION (AM K5)

    CPU speed       Clock speed         Multiplier             J16

      90MHz            60MHz               1.5x             Pins 1 & 2
                                                              closed

     100MHz            66MHz               1.5x             Pins 3 & 4
                                                              closed

     133MHz            66MHz               1.5x             Pins 3 & 4
                                                              closed

     166MHz            66MHz               2.5x            Pins 11 & 12
                                                              closed

                        CPU SPEED SELECTION (AM K6)

    CPU speed       Clock speed         Multiplier             J16

     166MHz            66MHz               2.5x            Pins 11 & 12
                                                              closed

     200MHz            66MHz                3x             Pins 13 & 14
                                                              closed

     233MHz            66MHz               3.5x            Pins 15 & 16
                                                              closed

     266MHz            66MHz                4x             Pins 17 & 18
                                                              closed

     300MHz            66MHz               4.5x            Pins 19 & 20
                                                              closed

                        CPU SPEED SELECTION (INTEL)

    CPU speed       Clock speed         Multiplier             J16

      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

     200MHz            66MHz                3x             Pins 13 & 14
                                                              closed

                      CPU SPEED SELECTION (INTEL MMX)

    CPU speed       Clock speed         Multiplier             J16

     166MHz            66MHz               2.5x            Pins 11 & 12
                                                              closed

     200MHz            66MHz                3x             Pins 13 & 14
                                                              closed

     233MHz            66MHz               3.5x             Pins 3 & 4
                                                              closed

                           CPU VOLTAGE SELECTION

   Voltage      JP1/pins 1 &   JP1/pins 3 &   JP1/pins 5 &   JP1/pins 7 &
                     2              4              6              8

    2.04v         Closed         Closed         Closed           Open

    2.10v         Closed         Closed         Closed          Closed

    2.14v          Open           Open           Open           Closed

    2.84v         Closed          Open           Open            Open

    2.94v         Closed          Open           Open           Closed

    3.24v         Closed         Closed          Open            Open

    3.34v         Closed         Closed         Closed           Open

    3.44v         Closed         Closed         Closed           Open

    3.54v         Closed         Closed         Closed          Closed

