Video apparatus employing VRAMs

Details Video apparatus employing VRAMs Video apparatus employing VRAMs

1987-03-19

1989-11-28

Oberley, Alvin

Communications: electrical

Land vehicle alarms or indicators

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

340798, G06F 1300

Patent

active

048840696

ABSTRACT:
A video card using VRAMs for a computer which includes a CPU and main memory. The VRAM addresses are generated in a manner making it unnecessary to have an integer number of scan lines per memory row. A counter keeps track of the shift register position in the VRAMs and a new row address is generated in hardware independent of the scan line. A look-ahead feature detects the approaching end of the shift register data and initiates a timing sequence to reload the shift register.

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patent: 4259668 (1981-03-01), Nishimura et al.
patent: 4283765 (1981-08-01), Rieger
patent: 4404554 (1983-09-01), Tweedy et al.
patent: 4491834 (1985-01-01), Oguchi
patent: 4685070 (1987-08-01), Flinchbaugh
IBM Enhanced Graphics Adapter, Aug. 2, 1984, pp. 1-75.
IBM Technical Disclosure Bulletin, vol. 19, No. 2, Jul. 1976, pp. 548-550, New York, U.S.; W. J. Auen et al.: "Dynamic Image Alignment".

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