Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-03-22
1981-06-02
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
340365R, 364707, G06F 302, G06F 100
Patent
active
042714044
ABSTRACT:
In a keyboard-equipped apparatus such as an electronic calculator, a plurality of gate circuits are provided which are enabled and disabled by key strobe signals and a common power supply control signal. The power supply control signal serves to initiate power supply from a power source to a central processing unit (CPU) and a display. The key strobe signals are developed from the CPU, with the respective levels being indefinite depending on or definite whether the central processing unit is appropriately powered. The power supply control signal is generated from a power controller. The actuation of a specified key included within a keyboard unit enables the power supply to the CPU and so on. The function of a conventional mechanical power switch may be eliminated because of the electronically controlled power supply control circuit.
REFERENCES:
patent: 3641328 (1972-02-01), Osborne
patent: 3946216 (1976-03-01), Dierendonck
patent: 3955185 (1976-05-01), Nishimura
patent: 4144580 (1979-03-01), Seki et al.
patent: 4158285 (1979-06-01), Heinsen et al.
patent: 4164666 (1979-08-01), Hirasawa
IBM Technical Disclosure Bulletin, "Battery Powered Data Entry Unit", Foster, pp. 3437-3438, Apr. 1973.
Groody James J.
Sharp Kabushiki Kaisha
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