YOUNG MICRO SYSTEMS, INC.

VS3486F (REV. 2.0)

Processor               80386DX/80486SX/80487SX/CX486DLC/80486DX/80486DX2
Processor Speed         25/33/50(internal)/50/66(internal)MHz
Chip Set                Symphony
Video Chip Set          None
Maximum Onboard Memory  32MB
Maximum Video Memory    None
Cache                   64/256KB
BIOS                    AMI
Dimensions              330mm x 218mm
I/O Options             None
NPU Options             80387DX/4167

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Turbo switch                J1       Power LED & keylock         J4

  Turbo LED                   J2       Speaker                     J5

  Reset switch                J3

                        USER CONFIGURABLE SETTINGS

               Function
                                           Label
                                                           Position

  »
      Factory configured - do not
      alter
                                            JP1
                                                         Unidentified

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       None

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         None

      5MB         (4) 1M x 9     (4) 256K x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         None

      17MB        (4) 4M x 9     (4) 256K x 9

      20MB        (4) 4M x 9      (4) 1M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                  CACHE CONFIGURATION

       Size
                        Bank 0
                                           Bank 1

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

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

  Note: The location of banks 0 & 1 are unidentified.

                        CACHE JUMPER CONFIGURATION

      Size              JP26               JP27               JP31

      64KB            Pins 2 & 3        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

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

                            CPU TYPE SELECTION

      Type
                      JP24
                                    JP25
                                                  JP28
                                                                 JP32

     80368DX
                     2 & 3
                                    2 & 3
                                                  2 & 3
                                                                2 & 3

    CX486DLC
                     2 & 3
                                    2 & 3
                                                  2 & 3
                                                                2 & 3

     80486SX
                     2 & 3
                                    1 & 2
                                                  1 & 2
                                                                1 & 2

  80486DX-25/33
                     2 & 3
                                    1 & 2
                                                  1 & 2
                                                                1 & 2

   80486DX-50
                     1 & 2
                                    1 & 2
                                                  1 & 2
                                                                1 & 2

    80486DX2
                     2 & 3
                                    1 & 2
                                                  1 & 2
                                                                1 & 2

  Note: Pins designated should be in the closed position.

                            CPU TYPE SELECTION

      Type         JP33    JP34     JP35      JP36       JP37      JP38

     80368DX       2 & 3   2 & 3   Closed    Closed      Open      Open

    CX486DLC       2 & 3   2 & 3   Closed    Closed      Open      Open

     80486SX       1 & 2   1 & 2    Open      Open       Open      Open

  80486DX-25/33    1 & 2   1 & 2    Open      Open       Open      Open

   80486DX-50      1 & 2   1 & 2    Open      Open      Closed    Closed

    80486DX2       1 & 2   1 & 2    Open      Open       Open      Open

  Note: Pins designated should be in the closed position.

                            CPU TYPE SELECTION

      Type
                   JP39
                             JP40
                                       JP41
                                                 JP42
                                                           JP43
                                                                    JP44

     80368DX
                  Closed
                             Open
                                       Open
                                                 Open
                                                           Open
                                                                    2 & 3

    CX486DLC
                  Closed
                             Open
                                       Open
                                                 Open
                                                           Open
                                                                    2 & 3

     80486SX
                   Open
                             Open
                                       Open
                                                 Open
                                                          Closed
                                                                    1 & 2

  80486DX-25/33
                   Open
                            Closed
                                      Closed
                                                Closed
                                                           Open
                                                                    1 & 2

   80486DX-50
                   Open
                            Closed
                                      Closed
                                                Closed
                                                           Open
                                                                    1 & 2

    80486DX2
                   Open
                            Closed
                                      Closed
                                                Closed
                                                           Open
                                                                    1 & 2

  Note: Pins designated should be in the closed position.