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Office of Scientific and Technical Information
 

Self-patching firmware program. [Method of branching to auxiliary program without hardware or software modification]

Technical Report ·
DOI:https://doi.org/10.2172/7316183· OSTI ID:7316183
A method of branching to an auxiliary program without any hardware or software modification at the time the auxiliary program will be written is described. Suitable statements in the main program are already prepared to accept a future program that will be written in machine language. The main program is stored as firmware in PROM memory, while the auxiliary program is loaded into RAM memory. The method is described for the Intel 8080 microprocessor, but can be generalized for any microprocessor or minicomputer that uses ROMs or PROMs. 1 figure, 2 tables.
Research Organization:
Los Alamos Scientific Lab., NM (USA)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
7316183
Report Number(s):
LA-6634-MS
Country of Publication:
United States
Language:
English

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