
J-MARK COMPUTER CORPORATION

J-656VXB

Processor            CX M1/AM K5/Pentium
Processor Speed      75/90/100/120/133/150/166/200MHz
Chip Set             Intel
Video Chip Set       None
Maximum Onboard      128MB (EDO supported)
Memory
Maximum Video Memory None
Cache                256/512KB
BIOS                 Award
Dimensions           270mm x 220mm
I/O Options          32-bit PCI slots (3), floppy drive interface, green PC
                     connector, IDE interfaces (2), parallel port, PS/2
                     mouse interface, serial ports (2), cache slot, IR
                     connector
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port 1              CN1       IDE interface LED          JC5

  Serial port 2              CN2       Power LED & keylock        JC6

  Parallel port              CN3       Turbo switch               JC7

  Floppy drive interface     CN4       Green PC connector         JC8

  IDE interface 2            CN5       IR connector               JP12

  IDE interface 1            CN6       Chassis fan power          JP21

  PS/2 mouse interface        J1       External battery           JP23

  Speaker                    JC2       32-bit PCI slots         PC1  PC3

  Reset switch               JC3       Cache slot                 SL1

  Turbo LED                  JC4

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           J4           Unidentified
      alter

     Factory configured - do not           JP3          Unidentified
      alter

      PCICLK select PCICLK/4               JP22             Closed

      PCICLK select PCICLK/3               JP22              Open

      PS/2 IRQ12 enabled                   JP29             Closed

      PS/2 IRQ12 disabled                  JP29              Open

      Flash BIOS voltage select 12v        JP33        Pins 1 & 2 closed

      Flash BIOS voltage select 5v         JP33        Pins 2 & 3 closed

                  DIMM/DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2

      8MB       (2) 1M x 36        None          None

      8MB           None           None       (1) 1M x 64

     16MB       (2) 2M x 36        None          None

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

     16MB           None           None       (1) 2M x 64

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

     32MB       (2) 4M x 36        None          None

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

     32MB           None           None       (1) 4M x 64

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

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

              DIMM/DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1        Bank 2

     64MB       (2) 8M x 36        None          None

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

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

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

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

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

  Note: Board accepts EDO memory.

                            CACHE CONFIGURATION

       Size            Bank 0               SL1                 TAG

    256KB (A)       (2) 32K x 32       Not installed        (1) 32K x 8

    256KB (B)           None            256KB module        (1) 32K x 8
                                         installed

    512KB (A)       (2) 32K x 32        256KB module        (1) 32K x 8
                                         installed

    512KB (B)           None            512KB module        (1) 32K x 8
                                         installed

                        CACHE JUMPER CONFIGURATION

         Size               JP1         JP2          JP7          JP8

       256KB (A)           1 & 2       1 & 2        1 & 2        1 & 2

       256KB (B)           1 & 2       1 & 2        1 & 2        1 & 2

   512KB (A, Jet-Way       2 & 3       1 & 2        2 & 3        1 & 2
        module)

    512KB (A, Intel        1 & 2       2 & 3        1 & 2        2 & 3
        module)

   512KB (B, Jet-Way       2 & 3       1 & 2        2 & 3        1 & 2
        module)

    512KB (B, Intel        1 & 2       2 & 3        1 & 2        2 & 3
        module)

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (CYRIX)

  CPU speed      Clock      Multiplier       J5         JP13       JP14
                speed

   120MHz       50MHz           2x         3 & 4,      Closed      Open
                                           5 & 6

   133MHz       55MHz           2x         3 & 4       Closed      Open

   150MHz       60MHz           2x         5 & 6       Closed      Open

   166MHz       66MHz           2x          Open       Closed      Open

  Note: Pins designated should be in the closed position.

                         CPU SPEED SELECTION (AMD)

  CPU speed      Clock      Multiplier       J5        JP13        JP14
                 speed

    90MHz        60MHz         1.5x         5 & 6      Open        Open

   100MHz        66MHz         1.5x         Open       Open        Open

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (INTEL)

  CPU speed     Clock      Multiplier       J5        JP13        JP14
                speed

   75MHz        50MHz         1.5x         3 & 4,     Open        Open
                                           5 & 6

   90MHz        60MHz         1.5x         5 & 6      Open        Open

   100MHz       66MHz         1.5x         Open       Open        Open

   120MHz       60MHz          2x          5 & 6     Closed       Open

   133MHz       66MHz          2x          Open      Closed       Open

   150MHz       60MHz         2.5x         5 & 6     Closed      Closed

   166MHz       66MHz         2.5x         Open      Closed      Closed

   200MHz       66MHz          3x          Open       Open       Closed

  Note: Pins designated should be in the closed position.

      CPU VOLTAGE SELECTION (SINGLE)

  Voltage     JP24       JP25      JP26

   3.3v      Closed      Open      Open

   3.45v      Open      Closed     Open

   3.52v      Open       Open     Closed

                       CPU VOLTAGE SELECTION (DUAL)

  Voltage     V      J11       J12      J13      JP24     JP25     JP26
            core

   3.3v     2.5v    Closed    Open     Open     Closed    Open     Open

   3.3v     2.8v     Open     Closed   Open      Open    Closed    Open

   3.3v     3.45v    Open     Open     Closed    Open     Open    Closed

  3.45v     2.5v    Closed    Open     Open     Closed    Open     Open

  3.45v     2.8v     Open     Closed   Open      Open    Closed    Open

  3.45v     3.45v    Open     Open     Closed    Open     Open    Closed

  3.52v     2.5v    Closed    Open     Open     Closed    Open     Open

  3.52v     2.8v     Open     Closed   Open      Open    Closed    Open

  3.52v     3.45v    Open     Open     Closed    Open     Open    Closed

MOS

                              CMOS SELECTION

            Setting                     JP23                 JP35

        CMOS memory normal      Pins 2 & 3 closed           Open
             operation

         CMOS memory clear       Pins 3 & 4 closed          Closed

