System for storing and retreiving display information in a plura

Details System for storing and retreiving display information in a plura System for storing and retreiving display information in a plura

1983-02-28

1987-09-01

Williams, Jr., Archie E.

Boots, shoes, and leggings

364521, 340747, 340750, 340798, 365230, G06F 1200, G06F 3153, G09G 102

Patent

active

046912959

ABSTRACT:
Apparatus for storing and retrieving display information in the memory of a video display terminal is disclosed. Terminal processor logical addresses are mapped into terminal memory in both a pixel address format and a word address format. Terminal memory is divided into four planes, each plane containing one bit of the 4-bit ordinal associated with each pixel in the color display image. Address interface logic generates the appropriate RAM row and column addresses based on the type of memory access and the purpose of the access. A plurality of separate write enable signals, separate upper and lower column address strobe signals and separate row address strobes for each plane allow flexibility in placing data in or removing data from terminal memory planes.

REFERENCES:
patent: 4055754 (1977-10-01), Chesley
patent: 4303986 (1981-12-01), Lans
patent: 4435792 (1984-03-01), Bechtolsheim
patent: 4509043 (1985-04-01), Mossaides

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