Program patching in microcomputer

Details Program patching in microcomputer Program patching in microcomputer

1982-02-19

1985-09-17

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 900, G06F 700

Patent

active

045424535

ABSTRACT:
A single-chip microcomputer device contains on-chip program storage in a read-only memory (ROM), and this program may be corrected or updated by patching. The ROM addresses are applied to an off-chip memory device containing one bit for each potential ROM address, and each bit is set to mark the beginning address of code to be patched; an interrupt is signalled when one of these set bits is accessed by an address occurring during operation of the microcomputer. The interrupt causes the processor to branch to an off-chip program memory to insert the patch code. The patch ends in a branch back to the on-chip ROM.

REFERENCES:
patent: 3911406 (1975-10-01), McLaughlin et al.
patent: 4400798 (1983-08-01), Francis et al.
IBM Technical Disclosure Bulletin, vol. 16, No. 12, May 1974, pp. 3841-3842.
IBM Technical Disclosure Bulletin, vol. 19, No. 3, Aug. 1976, pp. 1067-1068.
IBM Technical Disclosure Bulletin, vol. 16, No. 8, Jan. 1974.

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