Firmware modification system wherein older version can be retrieved
US5450589A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Dec 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/328
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A firmware modification system in a data processing apparatus, containing a processor for executing a program and a working program holding unit for holding therein data of the program executed by the processor. The system also includes fixed program data storing unit for storing a fixed program data and a modification data storing unit for storing modification data with which the fixed program data is to be modified, where the modification data storing unit is accessible from outside of the data processing apparatus for writing the modification data therein. A fixed program data loading unit is used for reading from the fixed program data storing unit, and loading the fixed program data in the working program holding unit to hold the fixed program data therein, and a working program modifying unit is used for modifying data of the program which is held in the working program holding unit, with the modification data stored in the modification data storing unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.