Patent · US Expired

Control of input devices via a keyboard interface

US5504483A · kind A · utility

7Cited by

3References

4Claims

0Family size

Assignee

Siemens Nixdorf Informationssysteme AG · DE

Inventors

Stefan Hoffmann · Mülheim an der Ruhr, DE
Rudiger Koeppen · Berlin, DE
Michael Kochmann · Berlin, DE

Key dates

Filing date	Jul 22, 1994
Grant date	Apr 2, 1996
Priority date	—
Expiry date	Jul 22, 2014

Classification

Technology area (CPC G)Physics
CPC primaryG06F3/023
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

For operating input devices such as magnetic card readers (22) or keyswitches (23) on personal computers (11), these are connected to the keyboard processor (18) and activated by hitherto unused control codes. The data of the input devices are recoded into data for possible key operations and the data transmission to the personal computer is initiated by the code for a non-existent key. As a result, the keyboard controller in the personal computer does not need to be reprogrammed, and the function of the input device cannot be simulated via the keyboard.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.