Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1984-07-30
1987-12-22
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340814, G09G 116
Patent
active
047149191
ABSTRACT:
Smooth scrolling is provided in a video display terminal having a cathode ray tube (CRT) controller which, by itself, is only capable of discontinuous, jump scrolling. The start-of-display address modification technique of advancing the start-of-display a single row at a time is combined with a display vertical position control normally used for changing the position of the display on the CRT faceplate. By sequentially erasing the top scan line, moving the entire display up one scan line by means of the vertical position control, erasing the second scan line, restoring the vertical position control to its original value, and advancing the CRT controller start address by two scan lines, the character rows are scrolled upward in a smooth, continuous manner. This sequence of operations is repeated a predetermined number of times for each character line with the "wrap-around" feature of a video memory used to provide new information for the bottom scan line.
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patent: 4342991 (1982-08-01), Pope et al.
patent: 4360805 (1982-11-01), Andrews et al.
patent: 4375638 (1983-03-01), O'Keefe et al.
patent: 4404554 (1983-09-01), Tweedy, Jr. et al.
patent: 4418344 (1983-11-01), Brown
patent: 4489317 (1984-12-01), Siga
Curtis Marshall M.
Zenith Electronics Corporation
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