Re: Small cover over toggle keys 41 blanknut Message #5 Posted by Wayne Brown on 16 Mar 2008, 2:54 p.m., in response to message #1 by Diehl-Peshkur
One of the primary uses for blanknuts was for companies that wanted to run custom applications. With a custom keyboard overlay and ROM module (or a program loaded from magnetic cards), a 41 could be given to a user who knew little or nothing about programmable calculators, but who had been trained to use the custom application. In such a situation the company's support team probably would not want the user turning off USER mode or fooling around with PRGM mode, because that would invite problems. So the USER and PRGM buttons were disabled, and many of the other keys were unlabeled so that users would not be aware that those keys could perform functions other than those labeled on the custom overlay. The calculator always would stay in USER mode and the keys only would perform the functions needed by the company's own special application.
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