
FREE COMPUTER TECHNOLOGY, INC.

486F55

Processor  CX486S/AM486SX/80486SX/CX486S2/AM486SX2/80486SX2/
           ODP487/80487SX/CX486DX/80486DX/CX486DX2/AM486DX2/
           (SL)AM486DX2(WB)/(SL)AM486DX2(WT)/80486DX2/AM486DX4/
           (SL)AM486DX4(WB)/(SL)AM486DX4(WT)/80486DX4/P24D/P24CT/
           P24C(WB)/P24T
Processor  25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   SIS
Video Chip None
Set
Maximum    256MB
Onboard
Memory
Maximum    None
Video
Memory
Cache      128/256/512KB
BIOS       Award
Dimensions 254mm x 218mm
I/O        32-bit PCI slots (3), floppy drive interface, green PC
Options    connector, IDE interfaces (2), parallel port, serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port                CN1       Turbo switch                J2

  Serial port                CN2       Green PC connector          J3

  Parallel port              CN3       Turbo LED                   J4

  Floppy drive interface     CN4       Reset switch                J5

  IDE interface 2            CN5       Power LED & keylock         J6

  IDE interface 1            CN6       Speaker                     J7

  IDE interface LED           J1       32-bit PCI slots         PC1 - PC3

                        USER CONFIGURABLE SETTINGS

                Function                     Label          Position

     CMOS memory normal operation            JP2       Pins 1 & 2 closed

      CMOS clear                              JP2       Pins 2 & 3 closed

      BIOS type select EPROM                  JP3             Open

      Flash BIOS type select 12v              JP3       Pins 1 & 2, 4 & 5
                                                             closed

      Flash BIOS type select 5v               JP3       Pins 2 & 3, 4 & 5
                                                             closed

     Parallel port IRQ select IRQ7           JP6       Pins 1 & 2 closed

      Parallel port IRQ select IRQ5           JP6       Pins 2 & 3 closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

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

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

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

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

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

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

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

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

     13MB       (1) 256K x    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36
                    36

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

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

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

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

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

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

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

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

     34MB       (1) 4M x 36    (1) 4M x 36       None       (1) 512K x 36

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

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

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

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

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

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

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

     49MB        (1) 256K x    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36
                     36

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

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

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

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

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

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

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

     67MB       (1) 16M x 36    (1) 256K x     (1) 256K x   (1) 256K x 36
                                   36             36

     76MB       (1) 16M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

    112MB       (1) 16M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

    130MB       (1) 16M x 36   (1) 16M x 36      None       (1) 512K x 36

    130MB       (1) 32M x 36      None           None       (1) 512K x 36

    130MB        (1) 512K x       None           None       (1) 32M x 36
                     36

    130MB           None       (1) 32M x 36      None       (1) 512K x 36

    130MB           None        (1) 512K x       None       (1) 32M x 36
                                   36

    130MB        (1) 256K x     (1) 256K x       None       (1) 32M x 36
                     36            36

    136MB       (1) 16M x 36   (1) 16M x 36      None        (1) 2M x 36

    136MB       (1) 32M x 36      None           None        (1) 2M x 36

    136MB       (1) 2M x 36       None           None       (1) 32M x 36

    136MB           None       (1) 32M x 36      None        (1) 2M x 36

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     136MB          None        (1) 2M x 36       None       (1) 32M x 36

     136MB       (1) 1M x 36    (1) 1M x 36       None       (1) 32M x 36

     160MB       (1) 16M x 36    (1) 16M x        None       (1) 8M x 36
                                    36

     160MB          None        (1) 8M x 36       None       (1) 32M x 36

     160MB       (1) 32M x 36      None           None       (1) 8M x 36

     160MB          None         (1) 32M x        None       (1) 8M x 36
                                    36

     160MB          None        (1) 8M x 36       None       (1) 32M x 36

     160MB       (1) 4M x 36    (1) 4M x 36       None       (1) 32M x 36

     193MB        (1) 256K x     (1) 16M x      (1) 16M x    (1) 16M x 36
                     36             36             36

     196MB       (1) 1M x 36     (1) 16M x      (1) 16M x    (1) 16M x 36
                                    36             36

     208MB       (1) 4M x 36     (1) 16M x      (1) 16M x    (1) 16M x 36
                                    36             36

     256MB       (1) 16M x 36    (1) 16M x      (1) 16M x    (1) 16M x 36
                                    36             36

     256MB       (1) 16M x 36    (1) 16M x        None       (1) 32M x 36
                                    36

     256MB       (1) 32M x 36      None         (1) 32M x        None
                                                   36

     256MB       (1) 32M x 36      None           None       (1) 32M x 36

     256MB          None         (1) 32M x        None       (1) 32M x 36
                                    36

     256MB          None         (1) 32M x      (1) 16M x    (1) 16M x 36
                                    36             36

                            CACHE CONFIGURATION

       Size             Bank 0           Bank 1               TAG

      128KB          (4) 32K x 8          None        (1) 8K/16K/32K x 8

    256KB (A)        (4) 64K x 8          None          (1) 16K/32K x 8

    256KB (B)        (4) 32K x 8       (4) 32K x 8      (1) 16K/32K x 8

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

                        CACHE JUMPER CONFIGURATION

      Size              JP15               JP16               JP20

      128KB           Pins 1 & 2        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

    256KB (A)         Pins 1 & 2        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

    256KB (B)         Pins 1 & 2        Pins 2 & 3      Pins 1 & 2 closed
                       closed             closed

      512KB           Pins 2 & 3        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

      CPU SPEED SELECTION

   Speed      JP22      JP23

   25MHz      Open      Open

   33MHz     Closed    Closed

   40MHz      Open     Closed

  50iMHz      Open      Open

  66iMHz     Closed    Closed

  75iMHz      Open      Open

  100iMHz    Closed    Closed

                            CPU TYPE SELECTION

         Type              JP8         JP9         JP10          JP11

        CX486S            Open       1 & 2, 5    2 & 3, 5 &    1 & 2, 4 &
                                       & 6       6, 7 & 8      5, 6 & 7

       AM486SX            Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

       80486SX            Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

       CX486S2            Open       1 & 2, 5    2 & 3, 5 &    4 & 5, 6 &
                                       & 6       6, 7 & 8          7

       AM486SX2           Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

       80486SX2           Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

        ODP487            Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       80487SX            Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       CX486DX            Open       1 & 2, 5    1 & 2, 5 &    4 & 5, 6 &
                                       & 6       6, 7 & 8          7

       80486DX            Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       CX486DX2           Open       1 & 2, 5    1 & 2, 5 &    4 & 5, 6 &
                                       & 6       6, 7 & 8          7

       AM486DX2           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

  (SL)AM486DX2 (WB)       2 & 3      2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

  (SL)AM486DX2 (WT)       2 & 3      2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       80486DX2           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       AM486DX4           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

  (SL)AM486DX4 (WB)       Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

  (SL)AM486DX4 (WT)       Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       80486DX4           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

         P24D             Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

        P24CT             Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

      P24C (WB)           Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

         P24T             Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

  Note: Pins designated should be in the closed position.

                           CPU VOLTAGE SELECTION

       Voltage               JP17             JP18             JP19

  3.3v (Intel/AMD 3v         Open             Open             Open
         CPU)

  3.6v (Cyrix 3v CPU)       Closed            Open             Open

          5v                 Open            Closed           Closed

                           DMA CHANNEL SELECTION

         Channel                   JP4                      JP5

             1             Pins 1 & 2 closed        Pins 1 & 2 closed

              3             Pins 2 & 3 closed        Pins 2 & 3 closed

