Computer footprint file

Details Computer footprint file Computer footprint file

1975-01-24

1976-01-27

Zache, Raulfe B.

Communications: electrical

Digital comparator systems

G06F 1100

Patent

active

039355632

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.

REFERENCES:
patent: 3551659 (1970-12-01), Forsythe
patent: 3588835 (1971-06-01), Enabnit
patent: 3588837 (1971-06-01), Rash et al.
patent: 3593297 (1971-07-01), Kadner
patent: 3644936 (1972-02-01), Holtwick et al.
patent: 3707725 (1972-12-01), Dellheim
patent: 3711863 (1973-01-01), Bloom
patent: 3721961 (1973-03-01), Edstrom et al.

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