Message waiting light control system

Details Message waiting light control system Message waiting light control system

1981-08-04

1984-03-20

Heckler, Thomas M.

Boots, shoes, and leggings

179 84C, G06F 1520, H04M 100

Patent

active

044385064

ABSTRACT:
A message waiting light control system for use in cooperation with a message storage and retrieval computer includes a microprocessor, a memory, address decoders, and an organization of message waiting lights, relays, and latches. The lights, relays and latches are organized in subgroups as memory mapped input/output words which correspond to the words of bits in the memory. Groups of the latches and relays are addressable. The microprocessor is responsive to an identification code number and a message waiting command to address the proper group and to write a data word to the proper subgroup to activate the selected light. In a similar manner, the lights may be deactivated.

REFERENCES:
patent: 3743792 (1973-07-01), Duff et al.
patent: 4072825 (1978-02-01), McLay et al.
patent: 4086441 (1978-04-01), Ullakko et al.
patent: 4140882 (1979-02-01), Regan et al.
patent: 4280021 (1981-07-01), Yuan

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