Apparatus for maintaining a history of the most recently execute

Details Apparatus for maintaining a history of the most recently execute Apparatus for maintaining a history of the most recently execute

1977-06-13

1979-11-27

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 1300

Patent

active

041763947

ABSTRACT:
An apparatus for maintaining a history of instructions which have been most recently executed by a digital computer. A push-down stack is utilized for storing the contents of the program address counter, or the operand portion of the instruction register, of the computer upon the execution of every instruction and then pushing down the push-down stack whenever the last instruction executed by the digital computer was a branch type instruction. Provision may also be made for addressing the push-down stack so that the contents thereof may be reviewed in the order opposite from which it was loaded. This apparatus allows a user or diagnostic program to have access to the address of the most recently executed branch type instructions. In this way, a history of the most recently executed instructions can be maintained to aid hardware and software diagnostics.

REFERENCES:
patent: 3366929 (1968-01-01), Mullery et al.
patent: 3396371 (1968-08-01), Waldecker
patent: 3449724 (1969-06-01), Boland et al.
patent: 3937938 (1976-02-01), Matthews
patent: 4016543 (1977-04-01), Franks et al.

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