Video display terminal with multi frequency dot clock

Details Video display terminal with multi frequency dot clock Video display terminal with multi frequency dot clock

1985-10-01

1987-10-20

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340735, 340748, 340749, G09G 116

Patent

active

047017538

ABSTRACT:
A video display terminal for selectively displaying a format of 80 characters per line and a format of 132 characters per line includes a microprocessor driven controller, a VCO for supplying the dot clock frequency, a frequency divider connected between the VCO and the controller and a crystal controlled phase detector coupled between the horizontal deflection signal output of the controller and the input of the VCO for smoothly changing the dot clock frequency in response to software induced changes in the controller.

REFERENCES:
patent: 4357604 (1982-11-01), Imazeki et al.
patent: 4430649 (1984-02-01), Leininger
patent: 4574279 (1986-03-01), Roberts
patent: 4575717 (1986-03-01), Fedele
patent: 4599611 (1986-07-01), Bowker et al.

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