
J-MARK COMPUTER CORPORATION

J-656VXC

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           254mm x 218mm
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), USB connectors (2)
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Speaker                    CN1       IDE interface 1             J4

  Reset switch               CN2       Serial port 2               J5

  Turbo LED                  CN3       IDE interface 2             J6

  IDE interface LED          CN4       Serial port 1               J7

  Power LED & keylock        CN5       Floppy drive                J8
                                       interface

  Turbo switch               CN6       USB connector               J9

  Green PC connector         CN7       USB connector              J10

  PS/2 mouse interface        J1       External battery           JP4

  Parallel port               J3       32-bit PCI slots         PC1  PC4

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           JP2          Unidentified
      alter

     Factory configured - do not           JP9          Unidentified
      alter

      Monitor type select color            JP13             Closed

      Monitor type select monochrome       JP13              Open

      Flash BIOS voltage select 12v        JP14        Pins 1 & 2 closed

      Flash BIOS voltage select 5v         JP14        Pins 2 & 3 closed

             DRAM 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

              CACHE CONFIGURATION

      Size          Bank 0           TAG

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

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

                        CPU SPEED SELECTION (CYRIX)

   CPU      Clock    Multiplier    JP6      JP7      JP8    JP18     JP19
  speed    speed

  120MHz   50MHz        2x        Closed   Closed    Open   Closed   Open

  133MHz   55MHz        2x         Open     Open     Open   Closed   Open

  150MHz   60MHz        2x         Open    Closed    Open   Closed   Open

  166MHz   66MHz        2x        Closed    Open     Open   Closed   Open

                         CPU SPEED SELECTION (AMD)

    CPU     Clock    Multiplier     JP6      JP7      JP8    JP18   JP19
  speed     speed

  90MHz     60MHz       1.5x       Open     Closed    Open   Open   Open

  100MHz    66MHz       1.5x       Closed    Open     Open   Open   Open

                        CPU SPEED SELECTION (INTEL)

   CPU     Clock    Multiplier    JP6      JP7     JP8    JP18      JP19
  speed    speed

  75MHz    50MHz      1.5x       Closed   Closed   Open   Open      Open

  90MHz    60MHz      1.5x       Open     Closed   Open   Open      Open

  100MHz   66MHz      1.5x       Closed   Open     Open   Open      Open

  120MHz   60MHz       2x        Open     Closed   Open   Closed    Open

  133MHz   66MHz       2x        Closed   Open     Open   Closed    Open

  150MHz   60MHz      2.5x       Open     Closed   Open   Closed   Closed

  166MHz   66MHz      2.5x       Closed   Open     Open   Closed   Closed

  200MHz   66MHz       3x        Closed   Open     Open   Open     Closed

                          CPU TYPE SELECTION

               Type                               JP3

               P54C                 Pins 1 & 2, 3 & 4, 5 & 6 closed

               P55C                               Open

      CPU VOLTAGE SELECTION (SINGLE)

  Voltage     JP15       JP16      JP17

   3.3v      Closed      Open      Open

   3.45v      Open      Closed     Open

   3.52v      Open       Open     Closed

                       CPU VOLTAGE SELECTION (DUAL)

  Voltage     V      JP10     JP11     JP12      JP15     JP16     JP17
            core

   3.3v     2.5v    Closed    Open     Open     Closed    Open     Open

   3.3v     2.8v     Open     Closed   Open     Closed    Open     Open

   3.3v     3.45v    Open     Open     Closed   Closed    Open     Open

  3.45v     2.5v    Closed    Open     Open      Open     Open     Open

  3.45v     2.8v     Open     Closed   Open      Open    Closed    Open

  3.45v     3.45v    Open     Open     Closed    Open    Closed    Open

  3.52v     2.5v    Closed    Open     Open      Open     Open    Closed

  3.52v     2.8v     Open     Closed   Open      Open    Closed   Closed

  3.52v     3.45v    Open     Open     Closed    Open     Open    Closed

MOS

                              CMOS SELECTION

            Setting                     JP4                   JP5

        CMOS memory normal      Pins 2 & 3 closed           Open
             operation

         CMOS memory clear       Pins 3 & 4 closed          Closed

