What was the first calculator with R-P and P-R keys?

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What was the first calculator with R-P and P-R keys?

04-22-2022, 02:15 PM (This post was last modified: 04-22-2022 02:21 PM by EdS2.)

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EdS2

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RE: What was the first calculator with R-P and P-R keys?

HP's 9100A from 1968 was by no means a handheld, but it was often described as a calculator - it has TO POLAR and TO RECT buttons.

(I checked Commodore, they came in somewhat later as far as I can tell, maybe 1976 or '77 with the 55-key M55. Edit: oh wait, 1975, the 5R39)

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Messages In This Thread

What was the first calculator with R-P and P-R keys? - EEVblog - 04-22-2022, 08:23 AM

RE: What was the first calculator with R-P and P-R keys? - Didier Lachieze - 04-22-2022, 08:36 AM

RE: What was the first calculator with R-P and P-R keys? - EEVblog - 04-22-2022, 08:49 AM

RE: What was the first calculator with R-P and P-R keys? - pavel nemec cz - 04-23-2022, 06:40 AM

RE: What was the first calculator with R-P and P-R keys? - EdS2 - 04-22-2022 02:15 PM

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