
YOUNG MICRO SYSTEMS, INC.

VEGA 486G-VIP (REV. 1.0)

Processor  80486SX/80486DX/80486DX2/80486DX4/P24D/Pentium Overdrive
Processor  25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Intel
Max.       128MB
Onboard
DRAM
Cache      128/256/512KB
BIOS       AMI
Dimensions 254mm x 218mm
I/O        32-bit VESA local bus slot, 32-bit PCI slots (3), IDE interface,
Options    PS/2 mouse connector
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Speaker                    CN1       IDE interface LED          CN6

  Reset switch               CN2       IDE interface              CN7

  Turbo LED                  CN3       32-bit PCI slots        PC1 - PC3

  Turbo switch               CN4       32-bit VESA local bus      SL1
                                       slots

  PS/2 mouse connector       CN5

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     IDE interface enabled                   JP4           pins 1 & 2
                                                              closed

      IDE interface disabled                  JP4           pins 2 & 3
                                                              closed

     Factory configured - do not             JP9              N/A
      alter

     Flash BIOS write protect                JP10          pins 2 & 3
      disabled                                                closed

      Flash BIOS write protect enabled        JP10          pins 1 & 2
                                                              closed

     Mouse IRQ12 enabled                     JP15            Closed

      Mouse IRQ12 disabled                    JP15             Open

     Monitor type select color               JP16            Closed

      Monitor type select monochrome          JP16             Open

     SMI disabled                            JP25          pins 2 & 3
                                                              closed

      SMI enabled                             JP25          pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

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

      4MB         (1) 512K x     (1) 512K x       NONE           NONE
                     36             36

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

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

      8MB        (1) 2M x 36       NONE           NONE           NONE

     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

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

     32MB        (1) 2M x 36    (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

     64MB        (1) 8M x 36    (1) 8M x 36       NONE           NONE

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

     128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

     256KB        (4) 64K 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

     512KB        (4) 64K x 8     (4) 64K x 8    (1) 32K x 8

                   CACHE JUMPER CONFIGURATION

   Size        JC1        JC2        JC3        JC4       JC5

   128KB      2 & 3      1 & 2      Open       Open       Open

   256KB      1 & 2      2 & 3      Open      Closed      Open

   256KB      1 & 2      1 & 2     Closed     Closed      Open

   512KB      1 & 2      1 & 2      Open      Closed     Closed

   512KB      1 & 2      1 & 2     Closed     Closed     Closed

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      Type           JP2          JP3        JP26       JP43      JR57

    80486SX       pins 2 & 3      Open       Open       Open     Closed
                    closed

    80486DX       pins 1 & 2      Open       Open       Open     Closed
                    closed

    80486DX2      pins 1 & 2     Closed     Closed      Open     Closed
                    closed

    80486DX4      pins 1 & 2     Closed     Closed      Open     Closed
                    closed

      P24D        pins 1 & 2     Closed     Closed      Open      Open
                    closed

     Pentium      pins 1 & 2     Closed     Closed      Open     Closed
   Overdrive        closed

                          CPU SPEED CONFIGURATION

     Speed           JP7            JP8           JP40           JP41

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

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

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

    50iMHz        pins 2 & 3     pins 2 & 3       Open          Closed
                   closed          closed

    66iMHz        pins 1 & 2     pins 2 & 3      Closed          Open
                   closed          closed

    75iMHz        pins 2 & 3     pins 2 & 3       Open          Closed
                   closed          closed

    100iMHz       pins 1 & 2     pins 2 & 3      Closed          Open
                   closed          closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

        Speed                  JP1

          2x            pins 1 & 2 closed

         2.5x           pins 2 & 3 closed

          3x                   Open

         CPU VOLTAGE CONFIGURATION

  Voltage     JV0        JV3        JV4

   3.3V       Open       Open      Open

   5.0V      Closed     Closed    Closed

  VESA WAIT STATE CONFIGURATION

   Wait states         JP36

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed        JP37

   <= 33MHz        Open

   > 33MHz        Closed

                            CMOS CONFIGURATION

         CPU Type                    JP12                   JP13

     CMOS memory normal             Closed                 Closed
         operation

     CMOS memory clear               Open                   Open

