By N. S. Newhall
Communications of the ACM,
August 1964,
Vol. 7 No. 8, Page 471
10.1145/355586.364794
Comments
To increase reliability of transmission between magnetic tape and core storage on an IBM 7090/7094, blocks or records of data are often assigned a word called a logical checksum. This is a number derived from the block by some simple algorithm and as unique to it as possible. The method most commonly used to form a checksum is to add together every datum in the block by the ACL (add and carry logical) instruction.
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