Option unit detecting apparatus for electronic equipment
US4951235A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Apr 19, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4063
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.