Back to results
US 5,857,118 AGranted
shared video display in a multiple processor computer system
AssigneeApple Computer, Inc.
InventorsDale R. Adams, David C. Buuck, Paul Thompson, David Townsley
Life of this patent
Estimating the term…
Abstract
A computer system having at least two subsystems which generate video signals and which share the same video display terminal. Provision is made to allow disabling of the current output of each system and controlling line reflections.
Claims14
Apparatus comprising:
- a first source of analog display signals including
- a first source of digital signals for producing a first digital signal and
- A first digital-to-analog converter for converting said first digital signal to a first analog signal;
- means for detecting a presence of a second source of analog display signals;
- means for permitting a current output of the first digital-to-analog converter to be disabled if said detector detects the presence of said second source of analog signals;
- and
- means for dynamically changing contents of a display image produced in response to said first source of analog display signals.
4 more elements
A computer system comprising:
- a first subsystem including
- a first source of digital signals including a first microprocessor for producing a first digital signal and
- a first digital-to-analog converter for converting said first digital signal to a first analog signal;
- a second subsystem including
- a second source of digital signals including a second microprocessor for producing a second digital signal and
- a second digital-to-analog converter for converting said second digital signal to a second analog signal;
- and
- an external video out connector arranged to receive said first analog signal and said second analog signal,
- wherein a first signal path between said first digital-to-analog converter and said external video connector is substantially longer than a signal path between said first digital-to-analog converter and said first source of digital signals.
6 more elements
Dependencies are inferred from the claim text.