Communications: electrical – Digital comparator systems
Patent
1974-11-01
1977-01-18
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 304, G08B 1100
Patent
active
040042790
ABSTRACT:
A digital controller comprises digital operating and processing means including an offering signal input terminal, an answerback signal input terminal, a data output bus, an input and output device designating bus, and a control signal bus; a plurality of output registers; a flip-flop circuit for storing an offering signal; a decoder circuit responsive to signals from the input and output designating bus and from the control signal bus to produce a control signal corresponding to a code signal for the decoder circuit when the code signal is designated and to reset an output register designated by a particular bit of the data output bus in response to a signal generated by a signal impressed upon the answerback signal input terminal to reset the flip-flop circuit for storing the offering signal; said plurality of register circuits being connected to receive an output signal from the operating and processing means designated by a particular bit of the data output bus; an offering signal holding circuit to hold a signal read out command for the operating and processing means and to apply the command upon the offering signal input terminal; and a logic circuit connected to receive an output signal from the output registers, a signal of a particular bit of the data output bus and an output signal from the offering signal holding circuit to produce a signal for the answerback signal input terminal corresponding to said three signals.
REFERENCES:
patent: 3302181 (1967-01-01), Lee
patent: 3378820 (1968-04-01), Smith
patent: 3407387 (1968-10-01), Looschen et al.
patent: 3456242 (1969-07-01), Lubkin et al.
patent: 3469243 (1969-09-01), Willcox et al.
patent: 3593299 (1971-07-01), Driscoll et al.
patent: 3693163 (1972-09-01), Johnson et al.
patent: 3710326 (1973-01-01), Nezu et al.
Pfund Charles E.
Rhoads Jan E.
Shaw Gareth D.
Yokogawa Electric Works, Ltd.
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