Vertical pre-control circuit for an interface of a multi-synchro

Details Vertical pre-control circuit for an interface of a multi-synchro Vertical pre-control circuit for an interface of a multi-synchro

1988-12-27

1990-04-10

Oberley, Alvin

Communications: electrical

Visual indication

Movable

358158, H04N 504

Patent

active

049164422

ABSTRACT:
In a vertical pre-control circuit for an interface of a multi-synchronization monitor that correlates the one of a computer system and adapter connected to the vertical pre-control circuit to a CRT monitor, the vertical pre-control circuit has first, second and third oscillation sections connected to an output terminal for connection to the CRT monitor, the first, second and third oscillation sections providing, when enabled, respective signals to the output terminal respectively characteristic of the one of the computer system and adapter. First and second logic sections respectively respond to positive waveforms of horizontal and vertical synchronization signals from respective terminals respectively for connection to the one of the computer system and adapter for enabling, respectively, the first and second oscillation sections. A logic controller responds to a specific frequency of the horizontal synchronization signal for overridingly disabling an enabled one of the first and second oscillation sections. A terminal for receiving, when connected to the adapter, a signal characteristic of the adapter is connected to the third oscillation section for enabling the same with the signal characteristic of the adapter. A third logic section responds to the signal characteristic of the adapter for overridingly disabling the first and second oscillation sections.

REFERENCES:
patent: 4727362 (1988-02-01), Rackley et al.
patent: 4779132 (1988-10-01), McBeath et al.

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