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 Memory

68MB

Maximum Video Memory

1MB

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

CONNECTIONS

Purpose

Location

Purpose

Location

Chassis fan power

C1

Parallel port

CN4

Speaker

C2

PS/2 mouse port

CN5

LED connector

C3

Floppy drive interface

CN6

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 alter

J3

Open

»

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 alter

SL2

Unidentified

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 (CON’T)

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.