Dual video output board with a shared memory interface

Details Dual video output board with a shared memory interface Dual video output board with a shared memory interface

1997-02-19

1999-09-07

Tung, Kee M.

Computer graphics processing and selective visual display system

Computer graphic processing system

Plural graphics processors

345 1, 345 3, 345521, 345501, G06F 1516

Patent

active

059494379

ABSTRACT:
The novel graphics system (10) includes multiple displays (20 and 22) supported by a single frame buffer (18) thereby reducing hardware requirements and costs. The system (10) further includes an operating system driver interface (12), a software driver interface (14) and graphics circuitry (16). In one embodiment, the graphics circuitry (16) includes a graphics chip (34) for providing an analog output (36) and a digital output (38). The digital output (38) is processed by a data reformatter (40) and a digital-to-analog converter (42) to provide an analog signal (44). The invention thus takes advantage of existing mixed output chips to implement a multiple analog CRT monitor system in a cost effective manner.

REFERENCES:
patent: 4965559 (1990-10-01), Dye
patent: 5488385 (1996-01-01), Singhal et al.
patent: 5555460 (1996-09-01), Ericsson
patent: 5694141 (1997-12-01), Chee
PC Graphics Struggle to Incorporate by Richard A. Quinnell from EDN Design Feature dated Mar. 14, 1996 at pp. 61, 62, 64, 66, 70,72 and 73.
Prudential Analyst Seek Better Times Ahead for Companies with Proprietary Products from Electronic Engineering Times dated Mar. 25, 1996 at p. 32.
Aurora 64V + Mobil Acceleration, Jul., 1996 at Introduction pp. 1-1 thru 1-2; CRT/TV Interface pp. 10-1 thru 10-5; and Flat Panel Interface at pp. 11-1 thru 11-14.
Appian's Home Page for Multiple Monitors dated Oct. 31, 1996.

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