Display device with memory

Details Display device with memory Display device with memory

1977-02-25

1979-07-31

Curtis, Marshall M.

Communications: electrical

Condition responsive indicating system

With particular system function

340286M, G08B 2500

Patent

active

041632249

ABSTRACT:
The present invention is a display device with a memory which stores the order of reception of actuating signals from a plurality of terminal units. When one of the terminal units produces a signal a first counter causes the outputs of all the terminal units to be scanned. Each terminal unit is connected to a resettable one shot circuit which is scanned under the control of the first counter. When the signaling terminal unit is scanned, the resettable one shot is triggered to advance the count of a second counter. Then the number in the first counter, which corresponds to the specific signaling terminal unit, is stored in one of a plurality of memory means which corresponds to the order of reception stored in the second counter. The resettable one shot circuits prevent the number of a specific terminal unit from being stored in a second memory means due to a continued or repeated signal. The numbers stored in the memory means may be recalled and displayed together with the order of reception with the aid of a manually controlled third counter which selects the memory means to drive a display.

REFERENCES:
patent: 3767851 (1973-10-01), Wick
patent: 3806907 (1974-04-01), Bound et al.
patent: 3855456 (1974-12-01), Summers et al.
patent: 3965469 (1976-06-01), Ryan

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