Honeywell Information Systems Inc.

Richard R Watkins

Joseph L Ryan

Nicholas R Long

John P Stafford

Frederick E Kobs

William E Peisel

Elias Safdie

Richard A Slater

C Steven Briggs

John M Doyle, Jr

A logical control system is provided for accommodating both single and double byte accesses to a video terminal system display memory to supply video character and visual attribute data to a video screen without limiting the quantity of visual attributes and without the needless occupation of video screen character positions by visual attribute characters.

Access control logic for video terminal display memory

A logic memory control system for accommodating plural read/write requests to a video terminal display memory is provided without the need for multiplexing common busses shared by the video terminal logic devices accessing the display memory, or for compromising video terminal data transfer rates.

CRT Refresh memory system

A logic system is provided in a video system for accommodating the display of both video data characters and graphic characters, and the application of visual attributes to such characters whether occurring singularly or in fields.

Character generator display system

A logic system is provided in a video system for accommodating the display of both video data characters and graphic characters.

Graphic and data character video display system

A logic system is provided in a video system for accommodating the display of video data characters and the application of visual attributes to such characters whether occurring singularly or in fields.

Data character video display system with visual attributes

A logic control system in a video display terminal is disclosed for synchronizing the operation of dual, asynchronously operating CRT control unit semiconductor chips to accommodate a substantially increased number of visual attributes per display row with minimal effect on data character transfer rates.

Dual CRT control unit synchronization system

A logic control system for a video display terminal is disclosed for accommodating vertically and horizontally varying entry points to a video memory to acquire first character bytes of rows of video information for display on a CRT screen. Dynamically changeable display page snapshots of the video memory, and the formation of display pages from randomly located rows of video information within the video memory are thereby provided.

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Chelmsford, MA, United States of America

Richard R Watkins