
YOUNG MICRO SYSTEMS, INC.

VEGA 3-486 CACHE

Processor             80386DX/80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed       16/20/25/33/40/50/66(internal)MHz
Chip Set              Symphony
Max. Onboard DRAM     32MB
Cache                 64/256KB
BIOS                  AMI
Dimensions            330mm x 218mm
I/O Options           None
NPU Options           80387

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Turbo switch                C1       Power LED & keylock         C4

  Turbo LED                   C2       Speaker                     C5

  Reset switch                C3

              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

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

     CACHE CONFIGURATION

     Size          Bank 0

     64KB        (8) 8K x 8

     256KB      (8) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size               P26               P27                 P31

      64KB            pins 1 & 2        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      256KB           pins 2 & 3        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

                          CPU TYPE CONFIGURATION

     Type          P24         P25         P28         P30         P32

    80386DX       2 & 3       1 & 2       1 & 2       1 & 2       1 & 2

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

  80486DX-25      2 & 3       2 & 3       2 & 3       2 & 3       2 & 3

  80486DX-33      2 & 3       2 & 3       2 & 3       2 & 3       2 & 3

  80486DX-50      1 & 2       2 & 3       2 & 3       2 & 3       2 & 3

  80486DX2-50     2 & 3       2 & 3       2 & 3       2 & 3       2 & 3

  80486DX2-66     2 & 3       2 & 3       2 & 3       2 & 3       2 & 3

  Note: Pins designated should be in the closed.

                      CPU TYPE CONFIGURATION (CON'T)

     Type         P33        P35         P36          P37          P38

    80386DX      1 & 2     Closed       Closed        Open        Open

    80486SX      2 & 3      Open         Open         Open        Open

  80486DX-25     2 & 3      Open         Open         Open        Open

  80486DX-33     2 & 3      Open         Open         Open        Open

  80486DX-50     2 & 3      Open         Open        Closed      Closed

  80486DX2-50    2 & 3      Open         Open         Open        Open

  80486DX2-66    2 & 3      Open         Open         Open        Open

  Note: Pins designated should be in the closed.

                      CPU TYPE CONFIGURATION (CON'T)

     Type         P39        P40       P41       P42        P43      P44

    80386DX      Closed      N/A       N/A       N/A        N/A     1 & 2

    80486SX       Open      Open      Open       Open     Closed    2 & 3

  80486DX-25      Open     Closed    Closed     Closed     Open     2 & 3

  80486DX-33      Open     Closed    Closed     Closed     Open     2 & 3

  80486DX-50      Open     Closed    Closed     Closed     Open     2 & 3

  80486DX2-50     Open     Closed    Closed     Closed     Open     2 & 3

  80486DX2-66     Open     Closed    Closed     Closed     Open     2 & 3

  Note: Pins designated should be in the closed.

