Title: Computer footprint file

Abstract: Apparatus for keeping track of the progress of a computer program by seleng specific operand and/or instruction references, comprising means for accessing an operand and an instruction reference. Means are connected to a memory data register of the computer and to the two accessing means for selecting one of a specific operand or instruction reference which is to be monitored. A random-access memory (RAM), has three inputs, including one from a memory address and one comprising the output from the selecting means for writing into the RAM the last N instruction and/or operand references, or any combination thereof. A circle counter has an input comprising the named output from the selecting means, for cycling the N references. Means are connected to the circle counter and to the RAM for replacing the oldest reference in the RAM by a new reference from the circle counter, that is, for updating the RAM. Means are connected to the updating means for reading out a specific instruction and/or operand reference.

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Other info:

Inventors: Unger, Robert A. (El Cajon, CA, US)

Application Number: 543720
Filing Date: 1975-01-24
Publication_date: 1976-01-27
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Class(es): 714/45
Other Classes:
US Patent Ref:

3551659	Dec, 1970	Forsythe	444/1.
3588835	Jun, 1971	Enabnit	340/172.
3588837	Jun, 1971	Rash et al.	340/172.
3593297	Jul, 1971	Kadner	340/172.
3644936	Feb, 1972	Holtwick et al.	444/1.
3707725	Dec, 1972	Dellheim	444/1.
3711863	Jan, 1973	Bloom	444/1.
3721961	Mar, 1973	Edstrom et al.	340/172.

Other Refs:
Primary Examiner: Zache, Raulfe B.
Assistant Examiner:
Attorney: Sciascia; Richard S., Johnston; Ervin F., Stan; John