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EdS2 · (This post was last modified: 08-17-2023 02:16 PM by EdS2.)

Looks like this is extracted from May 1983 HP Journal specifically the article Scientific Pocket Calculator Extends Range of Built-in Functions, by Eric A. Even, Paul J. McClellan, and Joseph P. Tanzini

Correcting an OCR error:

Quote:If every element in that column of the original matrix has an absolute value less than 10E-89, the value 10E-99 is used instead.

Edit to add: the following article in the same issue is on the HP-16C: A Pocket Calculator for Computer Science Professionals, by Eric A. Evet