Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-11-12
1980-10-28
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
307304, 307313, G06F 302
Patent
active
042310245
ABSTRACT:
A data-entry device for digital arithmetic processing apparatus which has a semiconductor integrated circuit provided with a plurality of terminals, key signal control leads, the one side ends of which are connected to respective ones of the plurality of terminals, and a keyboard device having terminals connected to the other side ends of the key signal control leads. The semiconductor integrated circuit includes a plurality of FET's with respective drains connected to respective terminals of the semiconductor integrated circuit with sources grounded and with gates applied with key signal-generating pulses in different timings. The semiconductor integrated circuit further includes at least one timing inhibition circuit which has a first input terminal connected to at least one of the terminals of the semiconductor integrated circuit and has a second input terminal supplied with a key signal-generating pulse. There is also provided at least one inverter connected to one of the plurality of terminals of the semiconductor integrated circuit. The keyboard device is provided with a plurality of key switches connected between the respective keyboard terminals. The data entry device operates such that upon receipt of a key signal-generating pulse the inhibition circuit inhibits a key signal from the corresponding key switch.
REFERENCES:
patent: 3631528 (1971-12-01), Green
patent: 3717871 (1973-02-01), Hatano et al.
patent: 3721976 (1973-03-01), Kuijsten
patent: 4051471 (1977-09-01), Hatano et al.
Caldwell Sr. John W.
Groody James J.
Tokyo Shibaura Electric Co. Ltd.
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