
DIGITAL EQUIPMENT CORPORATION

VENTURIS 486 (VER. 1.0)

Device Type      Mainboard
Processor        AM486DXL/AM486DXL2/P24D/P24T
Processor Speed  40/50(internal)/66(internal)/100(internal)MHz
Chip Set         Unidentified
Video Chip Set   S3
Maximum Onboard  68MB
Memory
Maximum Video    1MB
Memory
Cache            None
BIOS             Phoenix
Dimensions       254mm x 218mm
I/O Options      Floppy drive interface, IDE interfaces (2), parallel port,
                 PS/2 mouse port, serial ports (2), VGA port, riser slot
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Chassis fan power          C1        Parallel port             CN4

  Speaker                    C2        PS/2 mouse port           CN5

  LED connector              C3        Floppy drive              CN6
                                       interface

  VGA port                  CN1        IDE interface             CN7

  Serial port               CN2        IDE interface             CN8

  Serial port               CN3        Riser slot                SL1

  Note: VGA & serial ports are shown for location purposes only. The
  location may not be exact.

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           J3               Open
      alter

     Snoop select enabled                  J18        Pins 1 & 2 closed

      Snoop select disabled                 J18        Pins 2 & 3 closed

     On board video enabled                J19        Pins 2 & 3 closed

      On board video disabled               J19        Pins 1 & 2 closed

     Recovery mode normal operation        J21              Open

      Recovery mode enabled                 J21             Closed

     Password normal operation             J23              Open

      Password clear                        J23             Closed

     Factory configured - do not           SL2          Unidentified
      alter

                    SIMM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2

      4MB           4MB            None          None

      8MB           4MB        (1) 1M x 36       None

     12MB           4MB        (1) 1M x 36    (1) 1M x 36

     12MB           4MB        (1) 2M x 36       None

     16MB           4MB        (1) 1M x 36    (1) 2M x 36

     20MB           4MB        (1) 2M x 36    (1) 2M x 36

     20MB           4MB        (1) 4M x 36       None

     24MB           4MB        (1) 1M x 36    (1) 4M x 36

     28MB           4MB        (1) 2M x 36    (1) 4M x 36

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

     36MB           4MB        (1) 8M x 36       None

                        SIMM CONFIGURATION (CONT)

       Size             Bank 0             Bank 1             Bank 2

       40MB               4MB           (1) 1M x 36        (1) 8M x 36

       44MB               4MB           (1) 2M x 36        (1) 8M x 36

       52MB               4MB           (1) 4M x 36        (1) 8M x 36

       68MB               4MB           (1) 8M x 36        (1) 8M x 36

            Note: Bank 0 is factory installed and is not configurable.
            The location is unidentified.

                        VIDEO MEMORY CONFIGURATION

  Note: Board is factory installed with 1MB cache. The location is
  unidentified.

      CPU SPEED SELECTION

   Speed      J14        J15

   40MHz     Closed     Open

  50iMHz      Open      Open

  66iMHz      Open     Closed

  100iMHz     Open     Closed

                            CPU TYPE SELECTION

    Speed         J1          J2           J4           J9         J10

  AM486DXL      Closed      Closed       2 & 3        1 & 2       2 & 3

  AM486DXL2     Closed      Closed       2 & 3        1 & 2       2 & 3

    P24D         Open        Open        1 & 2        1 & 2       1 & 2

    P24T         Open        Open        1 & 2        1 & 2       1 & 2

  Note: Pins designated should be in the closed position.

