Method and apparatus facilitating communication between two keyboards and a single processor
US5136694A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1989 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Apr 7, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/021
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A computing device includes a system control processor, a built-in keyboard having a plurality of keys, a connector which facilitates connection of an external keyboard or keypad to the device, an electronic switch which is controlled by the internal keyboard processor and can electrically couple the connector to the system control processor. The internal keyboard processor monitors signals from the system control processor, connector and internal keyboard keys in order to open and close the analog switch so as to facilitate transfers between the system control processor and the internal keyboard through itself, and transfers between the system control processor and an external keyboard through the electronic switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.