General purpose keyboard for central processing unit with microprocessor and use of this keyboard with a microcomputer
US4879557A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1987 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Nov 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0238
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A general purpose keyboard for a central processing unit with microprocessor 9, characterized in that it includes at least one set 300 of variable allocation keys, a removable booklet 2 comprising at least two pages 20, 21 specifying allocation of the keys, photoelectric receiver R0, R1 for detecting the position of the pages 20, 21 of the booklet 2 and a keyboard processing unit 40 for supplying, in response to the detection of the position of the pages 20, 21 of the booklet 2 and to the activation of a key 32 of the keyboard belonging to the central processing unit or set 300, a different ASCII code according to the position of the pages of the booklet 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.