
FORTRESS SYSTEMS INTERNATIONAL

SPECTRUM II 486 PCI/ISA/VESA

Processor  CX486SX/AM486SX/80486SX/CX486DX/AM486DX/80486DX/
           CX486DX2/AM486DX2/80486DX2/CX486DX4/AM486DX4/80486DX4
Processor  25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Video Chip None
Set
Maximum    64MB
Onboard
Memory
Maximum    None
Video
Memory
Cache      128/256/512KB
BIOS       AMI/Award/MR BIOS
Dimensions 254mm x 218mm
I/O        32-bit VESA local bus slots (2), 32-bit PCI slots (4)
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  Turbo switch               J1        Power LED & keylock         J5

  Turbo LED                  J2        32-bit PCI slots        PC1  PC4

  Speaker                    J3        32-bit VESA local bus   SL1 & SL2
                                       slots

  Reset switch               J4

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     CMOS memory normal operation            JP2           Pins 1 & 2
                                                              closed

      CMOS memory clear                       JP2           Pins 2 & 3
                                                              closed

     Factory configured - do not alter      JP10A             Open

     Factory configured - do not alter      JP10B          Pins 1 & 2
                                                              closed

     Factory configured - do not alter      JP10C          Pins 2 & 3
                                                              closed

     Factory configured - do not alter      JP10D             Open

     Factory configured - do not alter      JP10E             Open

     Factory configured - do not alter      JP38A             Open

     Factory configured - do not alter      JP38B          Pins 1 & 2
                                                              closed

     Factory configured - do not alter      JP38C          Pins 2 & 3
                                                              closed

      IDE type select PCI IDE                JP38D            Closed

      IDE type select VESA IDE               JP38D             Open

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                       DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2        Bank 3

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

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

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

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

  Note: Board accepts x 32 SIMMs.

        DRAM JUMPER CONFIGURATION

       Setting               JP23

   1 BK installed     Pins 1 & 2 closed

   2 BK installed     Pins 2 & 3 closed

              CACHE CONFIGURATION

      Size          Bank 0           TAG

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

     256KB        (2) 64K x 32   (1) 32K x 8

     512KB        (4) 128K x 8   (1) 32K x 8

        CACHE JUMPER CONFIGURATION

        Size                 JP20

        128KB         Pins 1 & 2 closed

        256KB         Pins 1 & 2 closed

        512KB         Pins 2 & 3 closed

                            CPU SPEED SELECTION

       Speed              JP7              JP27               JP28

       25MHz            Closed           Pins 1 & 2         Pins 2 & 3
                                          closed             closed

       33MHz             Open            Pins 2 & 3         Pins 1 & 2
                                          closed             closed

      50iMHz            Closed           Pins 1 & 2         Pins 2 & 3
                                          closed             closed

      66iMHz             Open            Pins 2 & 3         Pins 1 & 2
                                          closed             closed

      75iMHz            Closed           Pins 1 & 2         Pins 2 & 3
                                          closed             closed

      100iMHz            Open            Pins 2 & 3         Pins 1 & 2
                                          closed             closed

            CPU TYPE SELECTION

        Type                 JP11

        Cyrix         Pins 2 & 3 closed

         AMD          Pins 1 & 2 closed

        Intel         Pins 1 & 2 closed

        CPU TYPE SELECTION

      Type             JP99

  All CPU types       Closed

    DX4 only           Open

                       FLASH BIOS VOLTAGE SELECTION

         Voltage                   JP12                     JP80

           5v               Pins 1 & 2 closed         Pins 1 & 3, 2 & 4
                                                           closed

           12v              Pins 2 & 3 closed         Pins 3 & 5, 4 & 6
                                                           closed

