
J-MARK COMPUTER CORPORATION

J-648AP

Processor            CX M1/IBM 6X86/AM K5/Pentium
Processor Speed      75/90/100/120/133/150/166/200MHz
Chip Set             SIS
Video Chip Set       None
Maximum Onboard      512MB (EDO supported)
Memory
Maximum Video Memory None
Cache                256/512KB
BIOS                 Award
Dimensions           250mm 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), VGA feature
                     connector, VGA interface, IR connector
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Chassis fan power          CN1       Parallel port               J6

  Speaker                    CN2       Serial port 2               J7

  Reset switch               CN3       Floppy drive                J8
                                       interface

  Turbo LED                  CN4       IR connector                J9

  Turbo switch               CN5       VGA feature connector      J10

  IDE interface LED          CN6       VGA interface              J11

  Green PC connector         CN7       IDE interface 2            J14

  Power LED & keylock        CN8       IDE interface 1            J15

  PS/2 mouse interface        J1       32-bit PCI slots         PC1  PC3

  Serial port 1               J2

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     CMOS memory normal operation          J18        Pins 2 & 3 closed

      CMOS memory clear                     J18        Pins 3 & 4 closed

      Flash BIOS voltage select 12v         JP5        Pins 1 & 2 closed

      Flash BIOS voltage select 5v          JP5        Pins 2 & 3 closed

     Factory configured - do not          JP10          Unidentified
      alter

     Factory configured - do not          JP18          Unidentified
      alter

     Factory configured - do not          JP25          Unidentified
      alter

      Monitor type select color            JP29             Closed

      Monitor type select monochrome       JP29              Open

      PS/2 mouse IRQ12 enabled             JP48             Closed

      PS/2 mouse IRQ12 disabled            JP48              Open

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       4MB        (2) 512K x 36         None

       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

          DRAM CONFIGURATION (CONT)

      Size          Bank 0          Bank 1

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

     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) 32M x 36       None

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

     264MB        (2) 32M x 36   (2) 1M x 36

     272MB        (2) 32M x 36   (2) 2M x 36

     288MB        (2) 32M x 36   (2) 4M x 36

     320MB        (2) 32M x 36   (2) 8M x 36

     384MB        (2) 32M x 36   (2) 16M x 36

     512MB        (2) 32M x 36   (2) 32M x 36

  Note: Board accepts EDO memory.

              CACHE CONFIGURATION

      Size          Bank 0           TAG

     256KB        (2) 32K x 32   (1) 32K x 8

     512KB        (2) 64K x 32   (1) 32K x 8

  CACHE JUMPER CONFIGURATION

     Size            JP3

     256KB           Open

     512KB          Closed

                        CPU SPEED SELECTION (CYRIX)

    CPU       Clock    Multiplier      JP4       JP9      JP11      JP26
   speed     speed

  120MHz     50MHz         2x         Closed    Open     Closed    1 & 2,
                                                                   3 & 4

  133MHz     66MHz         2x         Closed    Open     Closed     Open

  150MHz     60MHz         2x         Closed    Open     Closed    1 & 2

  166MHz     66MHz         2x         Closed    Open     Closed    3 & 4

  Note: Pins designated should be in the closed position.

                         CPU SPEED SELECTION (IBM)

    CPU       Clock    Multiplier      JP4       JP9      JP11      JP26
   speed     speed

  133MHz     55MHz         2x         Closed    Open     Closed     Open

  150MHz     60MHz         2x         Closed    Open     Closed    1 & 2

  166MHz     66MHz         2x         Closed    Open     Closed    3 & 4

  Note: Pins designated should be in the closed position.

                         CPU SPEED SELECTION (AMD)

    CPU        Clock     Multiplier     JP4      JP9      JP11      JP26
   speed      speed

   90MHz      60MHz         1.5x        Open     Open     Open     1 & 2

  100MHz      66MHz          2x         Open     Open     Open     3 & 4

  133MHz      66MHz          2x         Open     Open     Open     3 & 4

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (INTEL)

    CPU       Clock    Multiplier     JP4       JP9       JP11      JP26
   speed     speed

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

   90MHz     60MHz        1.5x        Open     Open       Open     1 & 2

  100MHz     66MHz        1.5x        Open     Open       Open     3 & 4

  120MHz     60MHz         2x         Open     Open      Closed    1 & 2

  133MHz     66MHz         2x         Open     Open      Closed    3 & 4

  150MHz     60MHz        2.5x        Open    Closed     Closed    1 & 2

  166MHz     66MHz        2.5x        Open    Closed     Closed    3 & 4

  200MHz     66MHz         3x         Open    Closed      Open     3 & 4

  Note: Pins designated should be in the closed position.

                           CPU VOLTAGE SELECTION

      Voltage           V core             JP16               JP17

       3.3v              2.8v           Pins 1 & 2      Pins 1 & 2 closed
                                          closed

       3.3v              3.45v          Pins 3 & 4      Pins 1 & 2 closed
                                          closed

       3.3v              3.52v          Pins 5 & 6      Pins 1 & 2 closed
                                          closed

       3.45v             2.8v           Pins 1 & 2      Pins 3 & 4 closed
                                          closed

       3.45v             3.45v          Pins 3 & 4      Pins 3 & 4 closed
                                          closed

       3.45v             3.52v          Pins 5 & 6      Pins 3 & 4 closed
                                          closed

       3.52v             2.8v           Pins 1 & 2      Pins 5 & 6 closed
                                          closed

       3.52v             3.45v          Pins 3 & 4      Pins 5 & 6 closed
                                          closed

       3.52v             3.52v          Pins 5 & 6      Pins 5 & 6 closed
                                          closed

