
FORCOM TECHNOLOGY CORPORATION

419

Processor  80486SX/CX486S/80487SX/CX486S2/80486DX/Am486DX/CX486DX/ODP486SX/80486DX2/Am468DX2/Cx486DX2/80486DX4/Pentium
           Overdrive
Processor  20/25/33/40/50/50(internal)/66i/75i/100iMHz
Speed
Chip Set   OPTI
Max.       128MB
Onboard
DRAM
Cache      64/128/256/512KB
BIOS       AMI
Dimensions 220mm x 260mm
I/O        32-bit VESA local bus slots (3), Green PC feature
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose               Location    Purpose                   Location

  External battery         J1       Green monitor power         JP63
                                    supply

  Power LED &             JP2       External power              JP68
  keylock                           management interface

  Turbo LED               JP16      Reset switch                 S1

  Turbo switch            JP17      32-bit VESA Local bus    SL1,SL2,SL3
                                    slots

  Speaker                 JP18

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP30            Closed

      Monitor type select monochrome          JP30             Open

     Normal CPU ADS# operation               JP36          pins 2 & 3

      Delay CPU ADS# clock operation          JP36          pins 1 & 2

     Power to CPU set at 5V                  JP64        pins 1 & 3, 2 &
                                                                4

      Power to CPU set at 3.3V (for           JP64        pins 4 & 6, 3 &
      Intel DX4 CPU)                                            5

      Set CPU external operation clock        JP65             Open
      to 3X

      Set CPU external operation clock        JP65            Closed
      to 2X

      Cache size enabled 64KB or 256KB        JP67            Closed

      Cache size enabled 128KB or             JP67             Open
      512KB

  Note:Jumper JP65, for any type of CPU other than above listed, leave
  "Open".

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

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

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

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

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

     64MB       (1) 16M x 36      NONE           NONE           NONE

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

    128MB       (1) 16M x 36   (1) 16M x 36      NONE           NONE

    128MB       (1) 16M x 36      NONE        (1) 16M x 36      NONE

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

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

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

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

                        CACHE JUMPER CONFIGURATION

    Size          JP10           JP11           JP13            JP50

    64KB          Open           Open         pins 2 & 3        Open
                                               closed

   128KB          Open          Closed        pins 1 & 2        Open
                                               closed

   256KB         Closed         Closed        pins 2 & 3        Open
                                               closed

   512KB         Closed         Closed        pins 1 & 2       Closed
                                               closed

                     INTERNAL CACHE TYPE CONFIGURATION

    CPU Type      Internal Cache Type         JP58             JP59

      P24T           Write-Through            Open              N/A

      P24T             Write-Back            Closed             N/A

      P24D           Write-Through            N/A              Open

      P24D             Write-Back             N/A             Closed

                          CPU TYPE CONFIGURATION

   CPU Type      JP3      JP5       JP8      JP42      JP43       JP44

   80486SX      Open      Open     pins 2    Open     pins 1      Open
                                    & 3                & 2

    AM486       pins 1   pins 2    pins 1    Open     pins 1      Open
                 & 2      & 3       & 2                & 2

    Cx486S      Open      Open     pins 2    pins 2   pins 1      Open
                                    & 3       & 3      & 2

   80487SX      pins 2   pins 2    pins 1    Open     pins 1      Open
                 & 3      & 3       & 2                & 2

   Cx486S2      Open      Open     pins 2    pins 2   pins 2      Open
                                    & 3       & 3      & 3

   80486DX      pins 1   pins 2    pins 1    Open     pins 1      Open
                 & 2      & 3       & 2                & 2

   Cx486DX      pins 1   pins 2    pins 1    pins 2   pins 1      Open
                 & 2      & 3       & 2       & 3      & 2

   Cx486DX2     pins 1   pins 2    pins 1    pins 2   pins 2      Open
                 & 2      & 3       & 2       & 3      & 3

  P24C (DX4)    pins 1   pins 2    pins 1    pins 1   pins 1     Closed
                 & 2      & 3       & 2       & 2      & 2

     P24T       pins 2   pins 2    pins 1    Open     pins 1      Open
                 & 3      & 3       & 2                & 2

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

  Note:Pins designated are in the closed position.

                    CPU TYPE CONFIGURATION (CONTINUED)

   CPU Type       JP45         JP46        JP47        JP48        JP49

   80486SX        Open         Open        Open        Open       pins 1
                                                                   & 2

    AMD486        Open         Open        Open        Open       pins 1
                                                                   & 2

    Cx486S        Open         Open       Closed      Closed      pins 1
                                                                   & 2

   80487SX        Open         Open        Open        Open       pins 1
                                                                   & 2

   Cx486S2        Open         Open       Closed      Closed      pins 2
                                                                   & 3

   80486DX        Open         Open        Open        Open       pins 1
                                                                   & 2

   Cx486DX        Open         Open       Closed      Closed      pins 1
                                                                   & 2

   Cx486DX2       Open         Open       Closed      Closed      pins 2
                                                                   & 3

  P24C (DX4)     Closed       Closed       Open        Open       pins 1
                                                                   & 2

     P24T         Open         Open        Open        Open       pins 1
                                                                   & 2

     P24D         Open         Open        Open        Open       pins 1
                                                                   & 2

  Note:Pins designated are in the closed position.

                     CPU TYPE (S-SERIES) CONFIGURATION

  CPU Type      JP3       JP5      JP8       JP42     JP43        JP44

   80486SX     Open      Open     pins 2    pins 1    pins 1     Closed
                                   & 3       & 2       & 2

   80486DX     pins 1    pins 2   pins 1    pins 1    pins 1     Closed
                & 2       & 3      & 2       & 2       & 2

  Note:Pins designated are in the closed position.

                     CPU TYPE (S-SERIES) CONFIGURATION

   CPU Type       JP45          JP46        JP47       JP48       JP49

   80486SX       Closed        Closed       Open       Open      pins 1 &
                                                                    2

   80486DX       Closed        Closed       Open       Open      pins 1 &
                                                                    2

  Note:Pins designated are in the closed position.

  BUS SPEED (ID3) CONFIGURATION

    CPU speed          JP34

    <= 33MHz           Open

     > 33MHz          Closed

  VESA WAIT STATE (ID2) CONFIGURATION

    Wait states             JP33

   0 wait states            Open

    1 wait state           Closed

                 SYSTEM CLOCK (NOT FOR P24C) CONFIGURATION

     Frequency             JP21             JP22               JP23

       20MHz            pins 2 & 3        pins 2 & 3        pins 1 & 2
                          closed           closed             closed

       25MHz            pins 2 & 3        pins 1 & 2        pins 2 & 3
                          closed           closed             closed

       33MHz            pins 1 & 2        pins 2 & 3        pins 2 & 3
                          closed           closed             closed

       40MHz            pins 2 & 3        pins 1 & 2        pins 1 & 2
                          closed           closed             closed

       50MHz            pins 1 & 2        pins 2 & 3        pins 1 & 2
                          closed           closed             closed

                SYSTEM CLOCK (FOR P24C (DX4)) CONFIGURATION

     Frequency             JP21             JP22               JP23

       25MHz            pins 2 & 3          Open            pins 2 & 3
                          closed                              closed

       33MHz               Open           pins 2 & 3        pins 2 & 3
                                           closed             closed

       50MHz               Open           pins 2 & 3           Open
                                           closed

