Interline spacing adjustment circuit in a scanning CRT visual di

Details Interline spacing adjustment circuit in a scanning CRT visual di Interline spacing adjustment circuit in a scanning CRT visual di

1982-06-21

1984-02-28

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

315395, 340749, 358180, G09G 116

Patent

active

044344201

ABSTRACT:
A scanning CRT visual display system is provided in which the operation of the CRT controller which provides video blanking pulses and horizontal and vertical sync pulses for controlling the CRT display is temporarily halted when a larger than normal vertical spacing between horizontal scan lines is desired. During the time that the operation of the CRT controller is halted, which is accomplished by the selective blocking of clock timing pulses to the controller, an auxiliary synchronous counter circuit effectively counts the clock timing pulses and provides a substitute horizontal sync pulse for the CRT display such that during the implementation of a larger than normal vertical step for the scanning CRT display system, horizontal sync pulses are always provided even though the operation of the CRT controller is temporarily suspended during this time.

REFERENCES:
patent: 4019090 (1977-04-01), Wolff et al.
patent: 4158837 (1979-06-01), Zahorsky
patent: 4237458 (1980-12-01), Lantz et al.
patent: 4240075 (1980-12-01), Bringol
patent: 4310840 (1982-01-01), Williams et al.
Motorola VP38 Service Manual, 10/81, pp. 16/21.
HG46505R CRT Controller (CRTC) Users Manual Hitachi Microcomputer System HMCS 6800, Publication HLN014.
Hitachi Series HD46505 (CRTC) Publication HLN013.
The Complete Motorola Microcomputer Data Library (1978), pp. 1-159 through 1-177.

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