Horizontal scroll method and apparatus

Details Horizontal scroll method and apparatus Horizontal scroll method and apparatus

1986-02-21

1989-02-07

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340724, 340792, G09G 116

Patent

active

048034789

ABSTRACT:
A horizontal scrolling apparatus that provides scrolling on a character-by-character basis including a screen memory and associated visual attribute memory having associated therewith a scroll control memory for storing at least one bit for controlling horizontal scrolling. A latch controls writing into the scroll control memory to provide an enable bit therein, only in those locations corresponding to characters that are to be scrolled. An offset number is stored in an offset register, which number is variable under computer control. Operation of an adding circuit is responsive to sensing of the enable bit for adding the offset number to the present screen address to provide an offset address. The offset address is coupled to the video memory for display of the character associated with the offset address in the screen address position.

REFERENCES:
patent: 3643252 (1972-02-01), Roberts, Jr.
patent: 3792462 (1974-02-01), Casey et al.
patent: 4204206 (1980-05-01), Bakula et al.
patent: 4404554 (1983-09-01), Tweedy, Jr. et al.
patent: 4437093 (1984-03-01), Bradley
patent: 4520356 (1985-05-01), O'Keefe et al.
patent: 4663617 (1987-05-01), Stockwell
patent: 4694406 (1987-09-01), Shibui et al.

Affiliated with

Also associated with

Rating

Horizontal scroll method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Horizontal scroll method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Horizontal scroll method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1087032