YOUNG MICRO SYSTEMS, INC.

VS486F (REV. 2.0)

Processor              80486SX/80487SX/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            4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                      J1       Turbo LED                  J4

  Power LED & keylock          J2       Turbo switch               J5

  Reset switch                 J3

              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           TAG

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

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

  Note: The location of the banks and TAG are unidentified.

                  CACHE JUMPER CONFIGURATION

  Size
           SW1/3
                   SW1/4
                            SW1/5
                                     SW1/6
                                              SW1/7
                                                       SW1/8

  64KB
            Off
                     On
                             Off
                                       On
                                               Off
                                                        On

  256KB
            On
                    Off
                              On
                                      Off
                                                On
                                                        Off

     CPU SPEED SELECTION

  Speed     SW1/1    SW1/2

  25MHz      Off       On

  33MHz      Off       On

  50iMHz     Off       On

  50MHz      On       Off

  66iMHz     Off       On

                            CPU TYPE SELECTION

   Type
             SW2/1
                    SW2/2
                            SW2/3
                                    SW2/4
                                            SW2/5
                                                    SW2/6
                                                            SW2/7
                                                                    SW2/8

  80486SX
             Off
                     On
                             Off
                                     On
                                             On
                                                    Off
                                                            Off
                                                                     Off

  80486DX
             Off
                     On
                             On
                                     On
                                             Off
                                                     On
                                                             On
                                                                     On

  80486DX2
             Off
                     On
                             On
                                     On
                                             Off
                                                     On
                                                            Off
                                                                     Off