
J-MARK COMPUTER CORPORATION

J-656HXA

Processor            Pentium
Processor Speed      75/90/100/120/133/150/166/200MHz
Chip Set             Intel
Video Chip Set       None
Maximum Onboard      384MB
Memory
Maximum Video Memory None
Cache                256/512KB
BIOS                 Award
Dimensions           280mm 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       Reset switch                J5

  Serial port 2              CN2       IDE interface LED           J6

  Floppy drive interface     CN3       Power LED & keylock         J7

  Parallel port              CN4       Turbo LED                   J8

  IDE interface 2            CN5       Green PC connector         JP16

  IDE interface 1            CN6       Chassis fan power          JP36

  PS/2 mouse interface        J2       IR connector               JP37

  Speaker                     J4       32-bit PCI slots         PC1  PC3

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     CMOS memory normal operation          J12        Pins 2 & 3 closed

      CMOS memory clear                     J12        Pins 3 & 4 closed

      Monitor type select color             JP2             Closed

      Monitor type select monochrome        JP2              Open

      PS/2 mouse IRQ12 enabled             JPS1             Closed

      PS/2 mouse IRQ12 disabled            JPS1              Open

      Flash BIOS voltage select 12v        JP17        Pins 1 & 2 closed

      Flash BIOS voltage select 5v         JP17        Pins 2 & 3 closed

     Factory configured - do not          JP26          Unidentified
      alter

     Factory configured - do not          JP30          Unidentified
      alter

                    DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2

      8MB       (2) 1M x 36        None          None

     16MB       (2) 2M x 36        None          None

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

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

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

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

     32MB       (2) 4M x 36        None          None

     32MB       (2) 1M x 36    (2) 1M x 36    (2) 2M x 36

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

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

     48MB       (2) 1M x 36    (2) 1M x 36    (2) 4M x 36

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

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

     64MB       (2) 8M x 36        None          None

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

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

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

                  DRAM CONFIGURATION (CONT)

      Size          Bank 0          Bank 1          Bank 2

      72MB        (2) 4M x 36     (2) 4M x 36    (2) 1M x 36

      80MB        (2) 1M x 36     (2) 1M x 36    (2) 8M x 36

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

      80MB        (2) 4M x 36     (2) 4M x 36    (2) 2M x 36

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

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

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

     128MB       (2) 16M x 36        None            None

     128MB        (2) 4M x 36     (2) 4M x 36    (2) 8M x 36

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

     136MB        (2) 1M x 36    (2) 16M x 36        None

     136MB        (2) 8M x 36     (2) 8M x 36    (2) 1M x 36

     144MB        (2) 1M x 36     (2) 1M x 36    (2) 16M x 36

     144MB        (2) 2M x 36    (2) 16M x 36        None

     144MB        (2) 8M x 36     (2) 8M x 36    (2) 2M x 36

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

     160MB        (2) 4M x 36    (2) 16M x 36        None

     160MB        (2) 8M x 36     (2) 8M x 36    (2) 4M x 36

     192MB        (2) 4M x 36     (2) 4M x 36    (2) 16M x 36

     192MB        (2) 8M x 36    (2) 16M x 36        None

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

     256MB        (2) 8M x 36     (2) 8M x 36    (2) 16M x 36

     264MB       (2) 16M x 36    (2) 16M x 36    (2) 1M x 36

     272MB       (2) 16M x 36    (2) 16M x 36    (2) 2M x 36

     288MB       (2) 16M x 36    (2) 16M x 36    (2) 4M x 36

     320MB       (2) 16M x 36    (2) 16M x 36    (2) 8M x 36

     384MB       (2) 16M x 36    (2) 16M x 36    (2) 16M x 36

  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)       (2) 64K x 32       Not installed        (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP19               JP20               JP35

    256KB (A)         Pins 1 & 2        Pins 2 & 3      Pins 1 & 2 closed
                       closed             closed

    256KB (B)         Pins 1 & 2        Pins 2 & 3      Pins 1 & 2 closed
                       closed             closed

    512KB (A)         Pins 1 & 2        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

    512KB (B)         Pins 1 & 2        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

                            CPU SPEED SELECTION

  CPU speed     Clock      Multiplier       JP22        JP23       JP41
               speed

   75MHz       50MHz          1.5x          Open        Open       1 & 2,
                                                                   3 & 4

   90MHz       60MHz          1.5x          Open        Open       1 & 2

   100MHz      66MHz          1.5x          Open        Open       3 & 4

   120MHz      60MHz           2x          Closed       Open       1 & 2

   133MHz      66MHz           2x          Closed       Open       3 & 4

   150MHz      60MHz          2.5x         Closed      Closed      1 & 2

   166MHz      66MHz          2.5x         Closed      Closed      3 & 4

   200MHz      66MHz           3x           Open       Closed      3 & 4

  Note: Pins designated should be in the closed position.

           CPU VOLTAGE SELECTION

  Voltage     JP32       JP33      JP34

   3.3v      Closed      Open      Open

   3.45v      Open      Closed     Open

   3.52v      Open       Open     Closed

