Keying input apparatus having a reduced number of output termina

Details Keying input apparatus having a reduced number of output termina Keying input apparatus having a reduced number of output termina

1974-04-01

1976-04-13

Curtis, Marshall M.

Communications: electrical

Systems

With specific power supply

340324R, 340365R, G09F 932

Patent

active

039507432

ABSTRACT:
A keying input apparatus operates as a function of two kinds of timing signals, one being of a first timing period and generally composed of a plurality of digit timing signals generated in a digit sequence and the other being of a second timing period for disabling a display device during that period, such that a plurality of pieces of information, such as the digit timing signals and/or segment selection signals for the display device, are provided from a plurality of output terminals during said first timing signal for the purpose of outputting thereof to the display device, and a plurality of different coded signals, each composed of a plurality of bits, in a bit sequence, are provided from the same said plurality of output terminals during said second timing signal, each of which output terminals is individually connected to a corresponding one of a plurality of key switches, which are commonly connected through a common terminal to a register, so that any desired coded signal, as selected by a corresponding one of said plurality of key switches, can be inputted to the register during the second timing period.

REFERENCES:
patent: 3715746 (1973-02-01), Hatano
patent: 3778815 (1973-12-01), Wright

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