Control apparatus for displaying alphanumeric characters
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United States of America Patent
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-
Apr 8, 1980
Grant Date -
N/A
app pub date -
Dec 12, 1977
filing date -
Dec 13, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus is described which permits a dual display on two pages one next to the other on a cathode ray tube. During the scanning of each line of n characters, the address of the character position k, where k is lower than n, is detected and in response to this detection, a signal is generated for stopping the counting of the character positions during a predetermined time. Thereafter, the address of the character position (k+1) is detected and in response to this second detection, an inhibit signal is produced for the duration of the stop signal for inhibiting the illumination of the spot on the CRT screen. Also the addresses of character positions o-k are converted into addresses of character positions n through (k+1) respectively in response to a select signal indicating the selection of one of the pages on the CRT screen.
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