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Difference between + key and += key
10-28-2022, 09:42 AM
Post: #1
Difference between + key and += key
Dear All,

I noticed that some early pocket calculator, like e.g. HP-10 (+= key only), Privileg Super 2002, Multiplus or some commercial desktop calculators, have a += key and a -= key, while most other machines have seperate +, - and = keys.

Does anybody know the functional and technical differences and the background reason why the alternatives += and -= keys were developed?

Thank you very much in advance.

Best regards

Karl
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10-28-2022, 12:34 PM
Post: #2
RE: Difference between + key and += key
This doesn’t fully answer your question, but it is a nice explanation of “adding machine logic”:

https://www.hpmuseum.org/hp10.htm

Nigel (UK)
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10-29-2022, 09:52 AM
Post: #3
RE: Difference between + key and += key
For details, see the examples in the HP-10 Owner's Handbook.
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10-30-2022, 08:56 AM
Post: #4
RE: Difference between + key and += key
Thank you a lot for your answers, Nigel and Thomas.

Best regards

Karl
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