
YOUNG MICRO SYSTEMS, INC.

VS486F/S-3VL

Processor        80486SX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/66(internal)MHz
Chip Set         Symphony
Max. Onboard DRAM64MB
Cache            64/256/1024KB
BIOS             AMI
Dimensions       230mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J1        Turbo switch              JP24

  Power LED & keylock        JP20       32-bit VESA Local bus      S1
                                        slot

  Speaker                    JP21       32-bit VESA Local bus      S2
                                        slot

  Reset switch               JP22       32-bit VESA Local bus      S3
                                        slot

  Turbo LED                  JP23

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not              J2            Unknown
      alter

     Flash BIOS write protect enabled        JP2           pins 1 & 2
                                                              closed

      Flash BIOS write protect                JP2           pins 2 & 3
      disabled                                                closed

     Factory configured - do not             JP3            Unknown
      alter

              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) 1M x 9      (4) 4M x 9

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

      64MB        (4) 16M x 9        NONE

                          CPU SPEED CONFIGURATION

  Speed     JA1     JP4      JP5        JP6       JP7      JP10     JP11

  25MHz     pins    pins     Open     Closed     Closed    pins    pins 2
           2 & 3   2 & 3                                   1 & 2    & 3

  33MHz     pins    pins    Closed     Open      Closed    pins    pins 2
           2 & 3   2 & 3                                   1 & 2    & 3

   50I      pins    pins     Open     Closed     Closed    pins    pins 1
   MHz     1 & 2   1 & 2                                   1 & 2    & 2

   66I      pins    pins    Closed     Open      Closed    pins    pins 2
   MHz     2 & 3   2 & 3                                   1 & 2    & 3

  Note:Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

  Speed   JP12     JP13     JP14    JP15    JP16    JP17     JP18     JP30

  25MHz   Closed   Open    Closed   Open    Open    Closed   Open     Open

  33MHz   Closed   Open    Closed   Open    Open    Closed   Open     Open

   50I    Closed  Closed    Open    Open   Closed   Closed   Closed   Open
  MHz

   66I    Closed  Closed    Open    Open   Closed   Closed   Closed   Open
  MHz

                      CACHE CONFIGURATION

      Size       Max Cachable        Cache           TAG

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

     128KB           32MB         (4) 32K x 8    (1) 32K x 8

     256KB           64MB        (4) 128K x 8    (1) 128K x 8

                        CACHE JUMPER CONFIGURATION

  Size        JP8          JP9         JP19         JP25          JP26

  64KB     pins 2 & 3   pins 1 & 2   pins 1 & 2   pins 1 & 2   pins 1 & 2

  256KB    pins 2 & 3   pins 1 & 2   pins 2 & 3   pins 2 & 3   pins 2 & 3

   1MB     pins 1 & 2   pins 2 & 3   pins 2 & 3   pins 2 & 3   pins 2 & 3

