
J-MARK COMPUTER CORPORATION

J-446A (V2.0)

Processor  80486SX/AM486DX2/CX486DX2/80486DX2/CX486DX4/AM486DX4/

           AM486DX4(WB)/AM486DX4(WT)/80486DX4(WB)/80486DX4(WT)/

           P24D/P24T/CX5X86/AM5X86
Processor  25/33/40/50(internal)/50/66(internal)/80(internal)/100(internal)/
Speed      120(internal)MHz
Chip Set   SIS
Video Chip None
Set
Maximum    128MB
Onboard
Memory
Maximum    None
Video
Memory
Cache      128/256KB
BIOS       Award
Dimensions 254mm x 218mm
I/O        32-bit PCI slots (3), floppy drive interface, green PC connector,
Options    IDE interfaces (2), parallel port, serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Parallel port              CN1       IDE interface LED          JP33

  IDE interface 2            CN2       Green PC connector         JP35

  IDE interface 1            CN3       Turbo LED                  JP37

  Floppy drive interface     CN4       Reset switch               JP38

  Serial port 1              CN5       Turbo switch               JP39

  Serial port 2              CN6       Power LED & keylock        JP40

  External battery           JP1       Green PC LED               LED1

  Speaker                    JP27      32-bit PCI slots         PC1 - PC3

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Monitor type select color             JP6             Closed

      Monitor type select monochrome        JP6              Open

     Factory configured - do not          JP13          Unidentified
      alter

     BIOS type select EPROM               JP19              Open

      BIOS type select 5v flash            JP19        Pins 2 & 3 closed

      BIOS type select 12v flash           JP19        Pins 1 & 2 closed

     Factory configured - do not          JP21          Unidentified
      alter

      Turbo enabled                        JP39        Pins 2 & 3 closed

      Turbo disabled                       JP39        Pins 1 & 2 closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        None           None           None
                    36

     2MB        (1) 512K x        None           None           None
                    36

     2MB        (1) 256K x     (1) 256K x        None           None
                    36             36

     3MB        (1) 512K x     (1) 256K x        None           None
                    36             36

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        None
                    36             36             36

     3MB        (1) 256K x     (1) 512K x        None           None
                    36             36

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

     4MB        (1) 512K x     (1) 256K x     (1) 256K x        None
                    36             36             36

     4MB        (1) 512K x     (1) 512K x        None           None
                    36             36

     4MB        (1) 256K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

     5MB       (1) 1M x 36     (1) 256K x        None           None
                                   36

     5MB        (1) 512K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

     6MB       (1) 1M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     6MB       (1) 1M x 36     (1) 512K x        None           None
                                   36

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     6MB        (1) 512K x     (1) 512K x     (1) 512K x        None
                    36             36             36

     7MB       (1) 1M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

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

     8MB       (1) 1M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

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

     8MB        (1) 512K x     (1) 512K x     (1) 512K x    (1) 512K x 36
                    36             36             36

     9MB       (1) 2M x 36     (1) 256K x        None           None
                                   36

     10MB      (1) 2M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     10MB      (1) 2M x 36     (1) 512K x        None           None
                                   36

     10MB      (1) 1M x 36     (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

     11MB      (1) 2M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     12MB      (1) 2M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

     12MB      (1) 2M x 36    (1) 1M x 36        None           None

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        None

     14MB      (1) 2M x 36     (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

     16MB      (1) 4M x 36        None           None           None

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

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

     17MB      (1) 4M x 36     (1) 256K x        None           None
                                   36

     18MB      (1) 4M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     18MB      (1) 4M x 36     (1) 512K x        None           None
                                   36

     19MB      (1) 4M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     20MB      (1) 4M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

     20MB      (1) 4M x 36    (1) 1M x 36        None           None

     20MB      (1) 2M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     20MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        None

     20MB      (1) 1M x 36    (1) 4M x 36        None           None

     22MB      (1) 4M x 36     (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

     24MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36        None

     24MB      (1) 4M x 36    (1) 2M x 36        None           None

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

     24MB      (1) 2M x 36    (1) 4M x 36        None           None

     28MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     28MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36

     32MB      (1) 8M x 36        None           None           None

     32MB      (1) 4M x 36    (1) 2M x 36    (1) 2M x 36        None

     32MB      (1) 4M x 36    (1) 4M x 36        None           None

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

     33MB      (1) 8M x 36     (1) 256K x        None           None
                                   36

     34MB      (1) 8M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     34MB      (1) 8M x 36     (1) 512K x        None           None
                                   36

     35MB      (1) 8M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     36MB       (1) 8M x 36    (1) 512K x     (1) 512K x        None
                                   36             36

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

     38MB       (1) 8M x 36    (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

     40MB       (1) 8M x 36   (1) 1M x 36    (1) 1M x 36        None

     40MB       (1) 8M x 36   (1) 2M x 36        None           None

     40MB       (1) 4M x 36   (1) 2M x 36    (1) 2M x 36     (1) 2M x 36

     44MB       (1) 8M x 36   (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     48MB       (1) 8M x 36   (1) 2M x 36    (1) 2M x 36        None

     48MB       (1) 8M x 36   (1) 4M x 36        None           None

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36        None

     52MB       (1) 1M x 36   (1) 4M x 36    (1) 4M x 36     (1) 4M x 36

     56MB       (1) 8M x 36   (1) 2M x 36    (1) 2M x 36     (1) 2M x 36

     64MB       (1) 8M x 36   (1) 4M x 36    (1) 4M x 36        None

     64MB       (1) 8M x 36   (1) 8M x 36        None           None

     64MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36     (1) 4M x 36

     68MB       (1) 1M x 36   (1) 8M x 36    (1) 8M x 36        None

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

     80MB       (1) 8M x 36   (1) 4M x 36    (1) 4M x 36     (1) 4M x 36

     96MB       (1) 8M x 36   (1) 8M x 36    (1) 8M x 36        None

     100MB      (1) 1M x 36   (1) 8M x 36    (1) 8M x 36     (1) 8M x 36

     104MB      (1) 2M x 36   (1) 8M x 36    (1) 8M x 36     (1) 8M x 36

     112MB      (1) 4M x 36   (1) 8M x 36    (1) 8M x 36     (1) 8M x 36

     128MB      (1) 8M x 36   (1) 8M x 36    (1) 8M x 36     (1) 8M x 36

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     128KB       (4) 32K x 8   (1) 8K x 8

     256KB       (4) 64K x 8   (1) 16K x 8

                  CACHE JUMPER CONFIGURATION

        Size                 JP7                  JP8

        128KB          Pins 1 & 2 closed   Pins 1 & 2 closed

        256KB          Pins 1 & 2 closed   Pins 2 & 3 closed

                          CPU SPEED CONFIGURATION

          Speed                    JP11                     JP12

          25MHz                    Open              Pins 1 & 2 closed

          33MHz              Pins 1 & 2, 3 & 4       Pins 1 & 2 closed
                                  closed

          40MHz             Pins 1 & 2 closed        Pins 1 & 2 closed

         50iMHz                    Open              Pins 1 & 2 closed

          50MHz             Pins 3 & 4 closed        Pins 2 & 3 closed

         66iMHz              Pins 1 & 2, 3 & 4       Pins 1 & 2 closed
                                  closed

         80iMHz             Pins 1 & 2 closed        Pins 1 & 2 closed

         100iMHz             Pins 1 & 2, 3 & 4       Pins 1 & 2 closed
                                  closed

         120iMHz            Pins 1 & 2 closed        Pins 1 & 2 closed

                            CPU TYPE SELECTION

      Type          JP9        JP10        JP14       JP15        JP16

     80486SX        Open       2 & 3       Open       Open        Open

    AM486DX2       2 & 3       2 & 3       Open       Open        2 & 3

    CX486DX2       2 & 3       2 & 3       Open       Open        Open

    80486DX2       2 & 3       2 & 3       Open       Open        Open

    CX486DX4       2 & 3       2 & 3       Open       Open        Open

    AM486DX4       2 & 3       1 & 2       Open       1 & 2       1 & 2

  AM486DX4 (WB)    2 & 3       1 & 2       Open       1 & 2       1 & 2

  AM486DX4 (WT)    2 & 3       2 & 3       Open       Open        1 & 2

  80486DX4 (WB)    2 & 3       1 & 2       Open       1 & 2       1 & 2

  80486DX4 (WT)    2 & 3       2 & 3       Open       Open        Open

      P24D         2 & 3       1 & 2       Open       1 & 2       1 & 2

      P24T         1 & 2       1 & 2      1 & 2       Open        Open

     CX5X86        2 & 3       2 & 3       Open       1 & 2       Open

     AM5X86        2 & 3       1 & 2       Open       1 & 2       1 & 2

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CONT)

      Type         JP17         JP20        JP23       JP24       JP25

    80486SX        2 & 3       Closed      1 & 2      4 & 5       2 & 3

    AM486DX2       Open         Open        Open      4 & 5      1 & 2, 3
                                                                   & 4

    CX486DX2       1 & 2       Closed       Open      2 & 3      1 & 2, 3
                                                                   & 4

    80486DX2       2 & 3       Closed      1 & 2      4 & 5      1 & 2, 3
                                                                   & 4

    CX486DX4       1 & 2       Closed       Open      2 & 3      1 & 2, 3
                                                                   & 4

    AM486DX4       2 & 3       Closed      2 & 3      4 & 5      1 & 2, 3
                                                                   & 4

  AM486DX4 (WB)    2 & 3       Closed      2 & 3      4 & 5      1 & 2, 3
                                                                   & 4

  AM486DX4 (WT)    Open         Open        Open      4 & 5      1 & 2, 3
                                                                   & 4

  80486DX4 (WB)    2 & 3       Closed      2 & 3      4 & 5      1 & 2, 3
                                                                   & 4

  80486DX4 (WT)    2 & 3       Closed      1 & 2      4 & 5      1 & 2, 3
                                                                   & 4

      P24D         2 & 3       Closed      2 & 3      4 & 5      1 & 2, 3
                                                                   & 4

      P24T         2 & 3       Closed       Open      1 & 2      1 & 2, 3
                                                                   & 4

     CX5X86        2 & 3       Closed      2 & 3      4 & 5      1 & 2, 3
                                                                   & 4

     AM5X86        2 & 3       Closed      2 & 3      4 & 5      1 & 2, 3
                                                                   & 4

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CONT)

      Type            JP26          JP28          JP29           JP30

     80486SX         3 & 4          Open          Open           Open

    AM486DX2         3 & 4          Open          Open           Open

    CX486DX2         2 & 3          2 & 3         2 & 3          Open

    80486DX2         3 & 4          Open          Open           Open

    CX486DX4         2 & 3          2 & 3         2 & 3          Open

    AM486DX4       1 & 2, 3 &       Open          1 & 2          Open
                       4

  AM486DX4 (WB)    1 & 2, 3 &       Open          1 & 2          Open
                       4

  AM486DX4 (WT)      3 & 4          Open          Open           Open

  80486DX4 (WB)    1 & 2, 3 &       Open          1 & 2          Open
                       4

  80486DX4 (WT)      3 & 4          Open          Open           Open

      P24D         1 & 2, 3 &       Open          1 & 2          Open
                       4

      P24T           3 & 4          1 & 2         1 & 2          Open

     CX5X86        1 & 2, 3 &       Open          1 & 2          Open
                       4

     AM5X86        1 & 2, 3 &       Open          1 & 2         2 & 3
                       4

  Note: Pins designated should be in the closed position.

                         CPU VOLTAGE CONFIGURATION

     Voltage             JP31               JP32               JP34

       3.3v            Pins 2 & 3        Pins 5 & 6         Pins 2 & 3
                        closed             closed             closed

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

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

        5v             Pins 1 & 2           N/A             Pins 1 & 2
                        closed                                closed

                 GREEN PC CONFIGURATION

          Setting                      JP36

         Doze mode               Pins 1 & 2 closed

        Suspend mode             Pins 3 & 4 closed

        Standby mode         Pins 5 & 6, 7 & 8 closed

                            CMOS CONFIGURATION

          Setting                    JP2                     JP3

     CMOS memory normal       Pins 1 & 2 closed       Pins 1 & 2 closed
         operation

     CMOS memory clear        Pins 2 & 3 closed       Pins 2 & 3 closed

                    DAM CHANNEL SELECTION

       Channel               JP18                 JP22

          1            Pins 1 & 3 closed   Pins 1 & 3 closed

          3            Pins 2 & 4 closed   Pins 2 & 4 closed

