System for improving access time to video display data using sha

Details System for improving access time to video display data using sha System for improving access time to video display data using sha

1991-01-24

1994-11-08

Gossage, Glenn

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

395164, 345185, 345201, 364DIG1, G06F 1200, G06F 1300, G06F 1562, G09G 102

Patent

active

053635000

ABSTRACT:
A system for improving access time to video display data uses a shadow memory having fewer storage locations than a display memory. The shadow memory and the display memory share a set of addresses such that data written to the display memory, at an address shared by the shadow memory, is identically written to the shadow memory. Read requests directed to the display memory result in: (a) data returned from the shadow memory when access to a shared address is requested, and (b) data returned from the display memory when access to a non-shared address is requested.

REFERENCES:
patent: 4958304 (1990-09-01), Moore
patent: 5170468 (1992-12-01), Shah et al.
patent: 5227863 (1993-07-01), Bilbrey et al.

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