
YOUNG MICRO SYSTEMS, INC.

VEGA 486 PCI/VESA

Processor        80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed  20/25/33/50(internal)/66(internal)MHz
Chip Set         Intel
Max. Onboard DRAM128MB
Cache            64/128/256/512KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (3), PCI bus slots (4)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                Location

  PS/2 mouse port            J1        Reset switch              J5

  Power LED & keylock        J2        32-bit VESA Local    SL1, SL2, SL3
                                       bus slots

  Speaker                    J3        32-bit PCI slots      P1, P2, P3,
                                                                 P4

  Turbo switch               J4

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not              J6              Open
      alter

     Factory configured - do not             JP15             Open
      alter

     Parity check enabled                    JP16             Open

      Parity check disabled                   JP16            Closed

     Monitor type select color               JP21          pins 1 & 2
                                                              closed

      Monitor type select monochrome          JP21          pins 2 & 3
                                                              closed

     Factory configured - do not             JP41             Open
      alter

     Factory configured - do not             JP43             Open
      alter

     Factory configured - do not             JP44             Open
      alter

     Factory configured - do not             JP81             Open
      alter

                            CMOS CONFIGURATION

       Type               JP22              JP23               JP26

    CMOS memory          Closed             Open               Open
      normal

    CMOS memory           Open             Closed             Closed
       clear

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       2MB        (2) 256K x 36         NONE

       4MB        (2) 256K x 36    (2) 256K x 36

       8MB         (2) 1M x 36          NONE

      10MB         (2) 1M x 36     (2) 256K x 36

      16MB         (2) 1M x 36      (2) 1M x 36

      32MB         (2) 4M x 36          NONE

      34MB         (2) 4M x 36     (2) 256K x 36

      40MB         (2) 4M x 36      (2) 1M x 36

      64MB         (2) 4M x 36      (2) 4M x 36

      64MB         (2) 8M x 36          NONE

      66MB         (2) 8M x 36     (2) 256K x 36

      72MB         (2) 8M x 36      (2) 1M x 36

      96MB         (2) 8M x 36      (2) 4M x 36

      128MB        (2) 8M x 36      (2) 8M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

      64KB        (4) 8K x 8      (4) 8K x 8     (2) 16K x 4

     128KB        (4) 32K x 8        NONE        (2) 16K x 4

     256KB        (4) 32K x 8     (4) 32K x 8    (2) 16K x 4

     512KB       (4) 128K x 8        NONE        (2) 32K x 4

              CACHE JUMPER CONFIGURATION

  Size       JP6        JP7        JP8         JP9

  64KB      Open        Open       Open       Open

  128KB    Closed       Open       Open      Closed

  256KB    Closed      Closed      Open      Closed

  512KB    Closed      Closed     Closed     Closed

                    CACHE JUMPER CONFIGURATION (CON'T)

    Size          JP10          JP11            JP17            JP18

    64KB          Open          Open         pins 2 & 3       pins 2 & 3
                                               closed          closed

   128KB          Open          Open         pins 2 & 3       pins 1 & 2
                                               closed          closed

   256KB         Closed         Open         pins 1 & 2       pins 2 & 3
                                               closed          closed

   512KB         Closed        Closed        pins 1 & 2       pins 1 & 2
                                               closed          closed

                          L2 CACHE CONFIGURATION

        Size                JI1               JI2               JI3

      Standard           pins 1 & 2        pins 1 & 2        pins 1 & 2
                          closed            closed            closed

     Interleaved         pins 2 & 3        pins 2 & 3        pins 2 & 3
                          closed            closed            closed

                        CACHE CONTROL CONFIGURATION

    Wait states      Tag bit size          JP14               JP20

   O wait states         7 bit          pins 1 & 2      pins 1 & 2 closed
                                          closed

   1 wait state          8 bit          pins 2 & 3      pins 2 & 3 closed
                                          closed

                       CACHE MODE CONFIGURATION (L2)

            Type                     JP4                    JP19

  L2 cache (write-through)           Open             pins 1 & 2 closed

   L2 cache (write-back)            Closed            pins 1 & 2 closed

    L2 cache (disabled)              N/A              pins 2 & 3 closed

               CACHE MODE CONFIGURATION (PENTIUM OVERDRIVE)

            Type                      JP2                    JP60

  Overdrive (write-through)           Open            pins 1 & 2 closed

   Overdrive (write-back)            Closed           pins 2 & 3 closed

                          CPU TYPE CONFIGURATION

      Type          JP1     JP3     JP12     JP13      JP27       JP28

   80486SX-20      2 & 3   1 & 2   2 & 3    2 & 3     Closed     Closed

   80486SX-25      2 & 3   1 & 2   2 & 3    2 & 3      Open      Closed

   80486SX-33      2 & 3   1 & 2   1 & 2    2 & 3     Closed      Open

   80486DX-20       1 &    1 & 2   2 & 3    2 & 3     Closed     Closed
                    2, 3
                    & 4

   80486DX-25       1 &    1 & 2   2 & 3    2 & 3      Open      Closed
                    2, 3
                    & 4

   80486DX-33       1 &    1 & 2   1 & 2    2 & 3     Closed      Open
                    2, 3
                    & 4

   80486DX2-50      1 &    1 & 2   2 & 3    2 & 3      Open      Closed
                    2, 3
                    & 4

   80486DX2-66      1 &    1 & 2   1 & 2    2 & 3     Closed      Open
                    2, 3
                    & 4

    Overdrive       1 &    2 & 3   1 & 2    2 & 3     Closed      Open
                    2, 3
                    & 4

  Note: Pins designated should be in the closed position.

                         CPU VOLTAGE CONFIGURATION

    Voltage         JP5/A         JP5/B          JP5/C          JP5/D

    5.0V CPU         Open          Open         Closed          Closed

  80486DX4 CPU       Open          Open          Open            Open

              VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU speed      Wait states          JP36            JP37

     < 33MHz      0 wait states         Open            Open

     > 33MHz       1 wait state        Closed          Closed

                         PCI ADDRESS CONFIGURATION

   Address (Slot     Address (Slot          JP70               JP71
        1)                2)

    Address 17        Address 17         pins 1 & 2         pins 1 & 2
                                           closed             closed

    Address 28        Address 29         pins 2 & 3         pins 2 & 3
                                           closed             closed

                           PCI IRQ CONFIGURATION

   IRQ Type      JP33 (IRQ9)   JP34 (IRQ10)   JP35 (IRQ11)   JP38 (IRQ14)

   Standard      pins 1 & 2     pins 1 & 2     pins 1 & 2     pins 1 & 2
                   closed        closed         closed          closed

   Inverted      pins 2 & 3     pins 2 & 3     pins 2 & 3     pins 2 & 3
                   closed        closed         closed          closed

    PCI LEVEL TRIGGER IRQ CONFIGURATION

       IRQ Type               JP39

         IRQ9           pins 1 & 2 closed

        IRQ10           pins 3 & 4 closed

        IRQ11           pins 5 & 6 closed

        IRQ14           pins 7 & 8 closed

        IRQ15          pins 9 & 10 closed

                  SYSTEM BIOS CONFIGURATION

        Type                 JP24                JP25

       Normal                Open          pins 1 & 2 closed

        Flash               Closed         pins 1 & 2 closed

       Recover               Open          pins 2 & 3 closed

