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Issue No. 01 - January (1968 vol. 17)
ISSN: 0018-9340
pp: 84-86
K. C. Knowlton , Bell Telephone Laboratories, Inc., Murray Hill, N. J.
A scheme is proposed for automatically detecting many programming errors; in particular, those errors which can cause a program to misbehave in different ways, depending upon how the faulty program and its data are mapped into storage. Error detection is accomplished by simultaneously running two versions of a program which purport to be logically identical, with appropriate hardware checking between them.

K. C. Knowlton, "A Combination Hardware-Software Debugging System," in IEEE Transactions on Computers, vol. 17, no. , pp. 84-86, 1968.
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