Video computer system including multiple graphics controllers an

Details Video computer system including multiple graphics controllers an Video computer system including multiple graphics controllers an

1984-05-21

1989-08-29

Moore, David K.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340744, 340745, 364521, G09G 100

Patent

active

048621560

ABSTRACT:
A video computer system and methods are disclosed for displaying video graphics on a video display screen. The video computer system employs two alternative video graphics controllers. A first graphics controller is typically one that has been previously available to consumers and which also has a substantial library of graphics programs which are designed to be executed compatibly thereon. The second graphics controller is typically not compatible with the first graphics controller, and accordingly executes a second type of graphics programs which also may not be compatibly executed on the first controller. A select circuit and methods are disclosed which automatically determine the type of graphics program presented to the system, and correspondingly selects the compatible graphics controller to execute the program. A protection circuit and methods are disclosed which authenticate the origin of the presented graphics programs, and which allow only authorized programs to be executed by the correspondingly selected compatible graphics controller.

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Cryptography, by Carl H. Meyer and Stephen M. Matyas, pp. 13-112 and 390-396, published by John Wiley & Sons (1982).

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