Firmware modification system wherein older version can be retrie

Details Firmware modification system wherein older version can be retrie Firmware modification system wherein older version can be retrie

1994-12-27

1995-09-12

Heckler, Thomas M.

G06F 906

Patent

active

054505895

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.

REFERENCES:
patent: 5086502 (1992-04-01), Malcolm
patent: 5202984 (1993-04-01), Kashio
patent: 5241672 (1993-08-01), Slomeenski et al.

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