What was the first calculator with R-P and P-R keys? - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: Not HP Calculators (/forum-7.html) +--- Forum: Not quite HP Calculators - but related (/forum-8.html) +--- Thread: What was the first calculator with R-P and P-R keys? (/thread-18290.html) |
What was the first calculator with R-P and P-R keys? - EEVblog - 04-22-2022 08:23 AM Long time no visit. I'm doing video on complex numbers and wondered what was the first calulator (any brand) that had R-P and P-R keys for complex number format conversion? I included an image of an original Casio FX-82, but there has to be eariler ones. Thanks. Dave. RE: What was the first calculator with R-P and P-R keys? - Didier Lachieze - 04-22-2022 08:36 AM I would say the HP-45 in 1973 with ->P and ->R as primary and secondary functions. RE: What was the first calculator with R-P and P-R keys? - EEVblog - 04-22-2022 08:49 AM (04-22-2022 08:36 AM)Didier Lachieze Wrote: I would say the HP-45 in 1973 with ->P and ->R as primary and secondary functions. Yep! Forgot about that. 1973 might be hard to beat? RE: What was the first calculator with R-P and P-R keys? - EdS2 - 04-22-2022 02:15 PM 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) RE: What was the first calculator with R-P and P-R keys? - pavel nemec cz - 04-23-2022 06:40 AM (04-22-2022 08:49 AM)EEVblog Wrote:(04-22-2022 08:36 AM)Didier Lachieze Wrote: I would say the HP-45 in 1973 with ->P and ->R as primary and secondary functions. Mine Compucorp 326 is from 1976 but how about Compucorp 320? The instruction brochure shows the date 1972 (invaluable KW archive): https://www.wass.net/manuals/Compucorp%20320.pdf Some memory refresh, Dave: EEVblog #663 0:15 https://youtu.be/ezr3CzGUVeQ KR P |