The Automatic Formation of a Constant Check Sum with Access to the Minsk-22 Computer Magnetic-Tape Storage,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
One of the methods of monitoring the authenticity of data in a magnetic-tape file is cyclically summing up words with a complement notation up to the check sum -77...77 by the last word in the file. On the Minsk-22 computer these operations are executed either before the file is noted onto the tape by cyclic summation and by the complement formation into FCMS or after the notation of the file by the complement formation from the check sum stored in the summator with repeated access to the accumulator for the complement notation. Both in this case and in the other case substantial machine time is lost. The report describes a circuit which permits avoiding these time losses and assures the automatic formation and notation of the complement up to the check sum -77...77 by the last word of the file during the notation of data onto magnetic tape.
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