
J-MARK COMPUTER CORPORATION

J-591A

Device Type      Mainboard
Processor        CX 6X86/IBM 6X86/CX 686MX/IDT C6/AM K5/AM
                 K6/Pentium/Pentium MMX
Processor Speed  90/100/120/133/150/166/180/200/233/266/300MHz
Chip Set         SIS 5591
Maximum Onboard  256MB (EDO & SDRAM supported)
Memory
Cache            512KB
BIOS             Unidentified
Dimensions       235mm x 220mm
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, AGP slot

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  AGP slot                   AGP       Serial port 2              CN1

  ATX power connector        ATX       Serial port 1              CN2

  Turbo LED                   C1       IDE interface 2            CN3

  Reset switch                C2       IDE interface 1            CN4

  Speaker                     C3       Floppy drive               CN5
                                       interface

  Turbo switch                C4       Parallel port              CN6

  Power LED & keylock         C5       IR connector               IR1

  IDE interface LED           C6       PS/2 mouse interface       JP1

  Soft off power supply       C7       32-bit PCI slots         PC1  PC3

  Chassis fan power           C8       USB connector              USB

  CPU fan power               C9       SCSI interface

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Keyboard power on disabled            JP2        Pins 2 & 3 closed

      Keyboard power on enabled             JP2        Pins 1 & 2 closed

     CMOS memory normal operation          JP4        Pins 1 & 2 closed

      CMOS memory clear                     JP4        Pins 2 & 3 closed

     Factory configured - do not           JP8          Unidentified
      alter

     Factory configured - do not           JP9          Unidentified
      alter

              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

         256MB              (2) 32M 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

      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 8

                       CPU SPEED SELECTION (CX 6X86)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

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

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

  200MHz   75MHz        2x        On    Off     Off    On     On     Off

                      CPU SPEED SELECTION (IBM 6X86)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

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

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

  200MHz   75MHz        2x        On    Off     Off    On     On     Off

                      CPU SPEED SELECTION (CX 6X86MX)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

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

  200MHz   66MHz       2.5x       On     On     Off    Off    On      On

  200MHz   75MHz        2x        On    Off     Off    Off    On     Off

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

  233MHz   75MHz       2.5x       On     On     Off    On     On     Off

                       CPU SPEED SELECTION (IDT C6)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

  150MHz   75MHz        2x        On    Off     Off    On     On     Off

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

                        CPU SPEED SELECTION (AM K5)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

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

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

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

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

                        CPU SPEED SELECTION (AM K6)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

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

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

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

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

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

                        CPU SPEED SELECTION (INTEL)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

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

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

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

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

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

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

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

                      CPU SPEED SELECTION (INTEL MMX)

   CPU      Clock   Multiplier   U4/1   U4/2    U4/3   U4/4   U4/5   U4/6
  speed    speed

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

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

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

            CPU VOLTAGE SELECTION

        Voltage                 JP10

         2.2v            Pins 1 & 2 closed

         2.8v            Pins 3 & 4 closed

         2.9v            Pins 5 & 6 closed

         3.2v            Pins 7 & 8 closed

         3.3v            Pins 9 & 10 closed

         3.45v          Pins 11 & 12 closed

         3.52v          Pins 13 & 14 closed

