 | | Re: Purimish fun
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| (...) I wonder why RPN calculators are so rare...When I was in elementary school, the only calculator in our house was a RPN HP with a 3-level stack (but it only displayed the top of the stack) It was bigger than most modern graphing calculators and (...) (25 years ago, 27-Mar-00, to lugnet.off-topic.fun)
| | | | | Re: Purimish fun
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| (...) Because HP had a patent on them, and by the time the patent ran out, there just wasn't enough market (I suspect most people real attached to RPN would also be fairly HP loyal). (...) What I want is a <$25 fairly simple calculator. I don't (...) (25 years ago, 27-Mar-00, to lugnet.off-topic.fun)
| | | | | Re: Purimish fun
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| (...) HP was not the only manufacturer of RPN calculators; I remember using a National Semiconductor RPN calc in the mid-70's. See (URL) for more non-HP RPN calcs. I tried to find the patent for RPN calcs on both (URL) and (URL), but neither one (...) (25 years ago, 27-Mar-00, to lugnet.off-topic.fun)
| | | | | Re: Purimish fun
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| Bad form, replying to my own post, but... (...) (URL) has the history from the HP viewpoint. (25 years ago, 27-Mar-00, to lugnet.off-topic.fun)
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