Electronic apparatus

Details Electronic apparatus Electronic apparatus

1995-03-02

1995-09-26

Beausoliel, Jr., Robert W.

Excavating

371 81, 3642453, 364DIG1, 39518506, 395420, G06F 1100

Patent

active

054541000

ABSTRACT:
An electronic apparatus for allowing firmware contained therein to be corrected externally at a mass production stage. Correction data with which to correct an internal ROM content are held in an external storage. The correction data are placed by a program residing in the ROM into a register and a RAM. A comparator compares an execution address on the address bus with a correction address in the register. In case of a match between the two addresses, the CPU is interrupted to execute the correction content placed in the RAM, the correction content taking the place of the data portion to be corrected in the ROM. If an update command is entered from the outside to update the content of the external storage, the storing of the correction data into the register and the RAM is inhibited.

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