Display system with symbol font memory

Details Display system with symbol font memory Display system with symbol font memory

1987-10-26

1990-04-17

Brigance, Gerald

Communications: electrical

Land vehicle alarms or indicators

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

340798, 340799, G09G 100

Patent

active

049184296

ABSTRACT:
In a display system of the type where one or more symbol tables 20 are stored in general purpose storage and include blocks of data forming symbol definitions for each of a set of symbols, and an all points addressable (APA) display buffer 30 is provided which includes on-screen APA storage 32 for data indicative of pels to be displayed on a screen and off-screen APA storage 34 for symbol definitions with buffer control logic 36 for associating symbol definitions in off-screen APA storage with locations in on-screen APA storage such that symbols are displayed at desired locations on the display screen, cache control logic 42 is provided for copying the definition of a symbol for display from the symbol table in general purpose storage to off-screen APA storage if the definition for the selected symbol is not already held in off-screen APA storage, whereby the off-screen APA storage is configured as a cache for holding definitions for selected symbols. A cache table 40 is provided in general purpose storage and comprises an entry for each symbol in the symbol set for pointing to the location in off-screen APA storage, if any, at which the corresponding symbol definition is held, each entry in the cache table also being associated with the location in the symbol table at which the corresponding symbol definition is stored.

REFERENCES:
patent: 4308532 (1981-12-01), Murphy
patent: 4400697 (1983-08-01), Currie et al.
patent: 4486856 (1984-12-01), Heckel et al.
patent: 4679038 (1987-07-01), Bantz et al.
patent: 4686525 (1987-08-01), Nagata
patent: 4718024 (1988-01-01), Guttag et al.
patent: 4752893 (1988-06-01), Guttag et al.
Canton, D. A., IBM Technical Disclosure Bulletin, vol. 25, No. 2, Jul. 1982, p. 843.

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