Programmable timing circuit for cathode ray tube

Details Programmable timing circuit for cathode ray tube Programmable timing circuit for cathode ray tube

1983-12-19

1987-02-17

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340724, G09G 116

Patent

active

046443401

ABSTRACT:
A programmable timing circuit for a cathode ray tube includes a register stack (48) in which events to be timed are stored so that they are presented to comparators (45, 46 or 47) in the sequence in which they will occur. Each event is coded in terms of the position (character, line or row) on the screen at which it is to occur and flags stored with the values are decoded to identify the event being timed when a match is found between the presented value and the count in a character, line or row counter (40, 41 or 42) which is indicative of the current beam position on the screen. Values in the register stack can also control internal operations of the timing circuit, for example re-setting counters or re-addressing the stack.

REFERENCES:
patent: 3396377 (1968-08-01), Strout
patent: 3522597 (1970-08-01), Murphy
patent: 4232374 (1980-11-01), Chung et al.
IBM Technical Disclosure Bulletin, vol. 19, No. 3, Aug. 1976, pp. 1081-1084, D. J. Chesarek, "Formattable Video Band Display".
IEEE Transactions on Consumer Electronics, vol. CE-27, No. 4, Nov. 1981, pp. 612-625, F. L. Toth, "New Ultra Low Cost CRT Controller is Ideally Suited to Personal Computer and Electronic Games Applications".

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