Accession Number : AD0749759

Title :   The Automatic Formation of a Constant Check Sum with Access to the Minsk-22 Computer Magnetic-Tape Storage,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Goncharov,V. A. ; Petrov,V. I.

Report Date : 04 AUG 1972

Pagination or Media Count : 9

Abstract : 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.

Descriptors :   (*DATA STORAGE SYSTEMS, MAGNETIC TAPE), (*MAGNETIC TAPE, MONITORS), CORE STORAGE, MAGNETIC CORES, QUALITY CONTROL, USSR

Subject Categories : Computer Hardware
      Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE