Visual display unit with character overstrike

Details Visual display unit with character overstrike Visual display unit with character overstrike

1985-11-04

1988-04-26

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340735, 340748, 340790, G09G 114

Patent

active

047407832

ABSTRACT:
A visual display unit with character overstrike capability includes a text store in which text is stored in data stream form. A formatter formats the stored text and loads character codes into a refresh buffer which together with a character generator display the characters on a raster scanned cathode ray tube. Control logic responsive to a backspace character combines the bit patterns corresponding to the characters preceding and succeeding the backspace character in a temporary store and then stores the composite bit pattern in the character generator and a pointer thereto in the refresh buffer. The control logic can be inhibited to allow the individual characters constituting the composite character to be displayed individually for editing purposes.

REFERENCES:
patent: 4204208 (1980-05-01), McCarthy
patent: 4443794 (1984-04-01), Sakurai
patent: 4464730 (1984-08-01), Lawrence et al.
patent: 4584573 (1986-04-01), Ito
patent: 4600920 (1986-07-01), Makita
patent: 4603330 (1986-07-01), Horne et al.

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