Option unit detecting apparatus for electronic equipment

Details Option unit detecting apparatus for electronic equipment Option unit detecting apparatus for electronic equipment

1989-04-19

1990-08-21

Lall, Parshotam S.

Boots, shoes, and leggings

G06F 300

Patent

active

049512358

ABSTRACT:
An option unit detecting apparatus detects whether an option unit is connected to or disconnected from an electronic equipment. The electronic equipment includes an electronic circuit having an input/output port, and the option unit includes at least one semiconductor device. When the option unit is disconnected from the electronic unit, a switching element is rendered ON and a low-level signal is applied to the input/output port of the electronic circuit. When the option unit is connected thereto, the switching element is rendered OFF and a high-level signal is applied thereto. Accordingly, it is possible to detect whether the option unit is connected to or disconnected from the electronic unit based upon the level of the signal applied to the input/output port.

REFERENCES:
patent: 4156931 (1979-05-01), Adelman et al.

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