Security arrangement for and method of rendering microprocessor-

Details Security arrangement for and method of rendering microprocessor- Security arrangement for and method of rendering microprocessor-

1983-12-05

1985-01-15

Shaw, Gareth D.

Communications: electrical

Continuously variable indicating

With meter reading

340 63, 340571, 364900, G08B 1306, G06F 700

Patent

active

044941145

ABSTRACT:
A lock-out security arrangement for and method of maintaining microprocessor-controlled electronic equipment normally operational until the occurrence of a disabling event, such as physical removal of the equipment from its normal installation, and/or electrical removal of the equipment from a source of electrical power, and thereupon for disabling the equipment after detecting the disabling event and for maintaining the equipment disabled, even after the disabling event has been discontinued, until a code manually entered via a keyboard associated with a microprocessor for controlling the normal operation of the equipment matches a private access code whose identity is protected from external interrogation by reason of being stored in an internal non-volatile memory of the microprocessor. The private access code is preferably selected by and known only to the user, and may be changed to a different private access code at the user's option.

REFERENCES:
patent: 2843843 (1958-07-01), Davis
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patent: 3815088 (1974-06-01), Kumpfbeck et al.
patent: 4090089 (1978-05-01), Morello
patent: 4103289 (1978-07-01), Kolber
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patent: 4267578 (1981-05-01), Vetter
patent: 4283710 (1981-08-01), Genest et al.
patent: 4284983 (1981-08-01), Lent
patent: 4437153 (1984-03-01), Kamiyama et al.
patent: 4438431 (1984-03-01), Toyomura
Nakamichi Mobile Sound System, TD-1200/PA-300/SP-400.

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