CRT cursor scan control circuits

Details CRT cursor scan control circuits CRT cursor scan control circuits

1975-09-12

1977-04-26

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

340324A, 340365S, G01R 1330

Patent

active

040203913

ABSTRACT:
The prolonged depression of a cursor scan control key on a CRT terminal keyboard generates a unique coded signal that is fed to a gating circuit. Prolonged depression is further detected by an astable circuit that generates repeated enabling pulses to the gating circuit so that the coded signal is repeatedly transferred to a separate programmable control unit. The unit is programmed to translate the repeated signals to a cursor scan command for a CRT which forms a part of the terminal.

REFERENCES:
patent: 3466645 (1969-09-01), Granberg et al.
patent: 3815127 (1974-06-01), Blumke et al.
patent: 3911419 (1975-10-01), Bates et al.

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