Dear colleagues, There is an implementation detail in the BESM-6 architecture the name of which we've struggled to translate adequately. There is a feature preventing execution of arbitrary data as instructions implemented using two parity bits per word, for the upper and the lower half-word. The overall parity must be odd, and one of the valid parity bit configurations denotes an instruction, and the other denotes data. In the original documentation this mechanism was called https://translate.google.com/#ru/en/%D1%81%D0%B2%D0%B5%D1%80%D1%82%D0%BA%D0%B0 (the two forms were called literally "command convolution" and "number convolution").
Unlike a tagged architecture, there isn't a fixed tag value to indicate instructions or data. Is there a standard term for this? "Convolution" sounds too mathematical. Thanks, Leo
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