Video memory controller

Details Video memory controller Video memory controller

1983-09-27

1987-02-10

Thomas, James D.

Boots, shoes, and leggings

340709, 340200, G06F 3153, G09G 302

Patent

active

046427899

ABSTRACT:
In an intelligent video terminal communicating with a central processor, a video memory controller is provided which performs a variety of data transfer operations in response to commands from a terminal processor. The data transfer operations include block reads and block writes, copying an entire screen data line or a portion thereof, scrolling an entire screen line or a portion thereof, filling a screen line or a portion thereof with a desired character, and independently scrolling a row segment within each of multiple independent screen display areas. In addition, the current location of the cursor within each screen display area can be monitored.
Many of the data transfer operations are performed by the video memory controller in response to a single terminal processor command, thereby minimizing terminal processor interrupts.

REFERENCES:
patent: 3166636 (1965-11-01), Rutland
patent: 3774161 (1973-11-01), Chambers
patent: 4070710 (1978-01-01), Sukonick
patent: 4120028 (1978-10-01), Membrino
patent: 4204206 (1980-05-01), Bakula
patent: 4278973 (1981-07-01), Hughes
patent: 4412294 (1983-10-01), Watts
patent: 4484302 (1984-11-01), Cason
patent: 4591845 (1986-05-01), Komatsu

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