
FREE COMPUTER TECHNOLOGY, INC.

486F38X

Processor   CX486S/80486SX/80486SX2/80487SX/CX486DX/80486DX/CX486DX2/
            80486DX2/80486DX4/Pentium Overdrive
Processor   25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set    OPTI
Max.        64MB
Onboard
DRAM
Cache       128/256/512KB
BIOS        Award
Dimensions  330mm x 218mm
I/O Options 32-bit VESA local bus slots (3), green PC connector
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  Turbo switch               J1       Break switch                 J6

  Turbo LED                  J2       External battery             J7

  Reset switch               J3       Green PC connector          JP2

  Power LED & keylock        J4       Green PC connector          JP3

  Speaker                    J5       32-bit VESA Local bus    SL1 - SL3
                                      slots

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CMOS memory normal operation            JP4           pins 2 & 3
                                                              closed

      CMOS memory clear                       JP4           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) 256K x     (1) 256K x        NONE           NONE
                    36              36

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

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

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

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

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

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

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

     10MB        (1) 256K x     (1) 256K x     (1) 1M x 36   (1) 1M x 36
                    36              36

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

     10MB          NONE         (1) 512K x     (1) 1M x 36   (1) 1M x 36
                                    36

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

     40MB          NONE        (1) 2M x 36     (1) 4M x 36   (1) 4M x 36

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

     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

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

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

                            CACHE CONFIGURATION

       Size              Bank 0            Bank 1              TAG

       128KB           (4) 32K x 8          NONE           (1) 8K x 8

       256KB           (4) 32K x 8       (4) 32K x 8      (1) 16K x 8 or
                                                           (1) 32K x 8

       256KB           (4) 64K x 8          NONE          (1) 16K x 8 or
                                                           (1) 32K x 8

       512KB           (4) 64K x 8       (4) 64K x 8       (1) 32K x 8

       512KB          (4) 128K x 8          NONE           (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

          Size                    JP12                      JP21

         128KB              pins 1 & 2 closed               Open

         256KB              pins 2 & 3 closed               Open

         256KB              pins 1 & 2, 3 & 4               Open
                                 closed

         512KB              pins 2 & 3, 4 & 5              Closed
                                 closed

         512KB              pins 1 & 2, 3 & 4              Closed
                                 closed

                          CPU TYPE CONFIGURATION

             Type                      JP6                   JP7

            CX486S                 1 & 2, 3 & 4      2 & 3, 4 & 5, 7 & 8,
                                                            9 & 10

         80486SX/SX2               2 & 3, 4 & 5      1 & 2, 3 & 4, 6 & 7,
                                                            8 & 9

           CX486DX                 1 & 2, 3 & 4      2 & 3, 4 & 5, 7 & 8,
                                                            9 & 10

           CX486DX2                1 & 2, 3 & 4      2 & 3, 4 & 5, 7 & 8,
                                                            9 & 10

         80486DX/DX2               2 & 3, 4 & 5      1 & 2, 3 & 4, 6 & 7,
                                                            8 & 9

        80486DX4 (2x)              2 & 3, 4 & 5      1 & 2, 3 & 4, 6 & 7,
                                                            8 & 9

       80486DX4 (2.5x)             2 & 3, 4 & 5      1 & 2, 3 & 4, 6 & 7,
                                                            8 & 9

        80486DX4 (3x)              2 & 3, 4 & 5      1 & 2, 3 & 4, 6 & 7,
                                                            8 & 9

          Overdrive                2 & 3, 4 & 5      1 & 2, 3 & 4, 6 & 7,
                                                            8 & 9

      Pentium Overdrive            1 & 2, 4 & 5      1 & 2, 3 & 4, 6 & 7,
                                                            8 & 9

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

         Type                JP11             JP14              JP15

        CX486S               Open         2 & 3, 5 & 6         3 & 4

      80486SX/SX2            Open         2 & 3, 4 & 5,        3 & 4
                                              6 & 7

        CX486DX              Open             3 & 4         1 & 2, 5 & 6

       CX486DX2              Open         1 & 2, 5 & 6      1 & 2, 3 & 4

      80486DX/DX2            Open         1 & 2, 4 & 5,        3 & 4
                                              6 & 7

     80486DX4 (2x)           2 & 3        1 & 2, 4 & 5,        3 & 4
                                              6 & 7

    80486DX4 (2.5x)          1 & 2        1 & 2, 4 & 5,        3 & 4
                                              6 & 7

     80486DX4 (3x)           Open         1 & 2, 4 & 5,        3 & 4
                                              6 & 7

       Overdrive             Open         1 & 2, 4 & 5,        3 & 4
                                              6 & 7

   Pentium Overdrive         Open         1 & 2, 4 & 5,        4 & 5
                                              6 & 7

  Note: Pins designated should be in the closed position.

         CPU SPEED CONFIGURATION

  Speed      JP17      JP19      JP20

  25MHz     Closed     Open     Closed

  33MHz     Closed    Closed     Open

  40MHz      Open      Open     Closed

  50iMHz    Closed     Open     Closed

  50MHz      Open     Closed     Open

  66iMHz    Closed    Closed     Open

  BUS SPEED CONFIGURATION

    Speed          JP24

   <= 33MHz        Open

   > 33MHz        Closed

