Hewlett-Packard HP-25 calculator, circa 1976/1977, still working Feb. 20, 2023. Bought from Blue Lakes Discount in Madison, WI. [Nikon Z6, w/14-30 f/4 S lens]
Thanks for sharing these memories from 70's! I made some screenshot of those cards, it is very exciting how you solved those functions in 50 steps. Runge Kutta's, Fourier, Impedances and root finder really a gem for me, thanks for sharing. I'll link your video, of course, if I use them somewhere. I really like to show people how minimal computing power is enough to solve really complex problems easily and for this the programmable calculators form 70's and 80's the best tools.
Nice presentation. I have a HP 25C. I bought it from a third party mail order company back in late 1976. I think their name was Electra or something like that. I was in tech school. I remember one of my instuctors said, the RPN made the easy problems hard and the hard problems easy. During the solid state class we did a lot of double power source problems. Also a lot of kirchoffs law. My HP25c worked a lot better than the TI's with algebraic notation. I made a program to make the display keep track of time. It worked like a clock. Function great. Thanks again. My HP25c still works also.
Not non-cmos, non-continous memory. The tech inside is still cmos, it's just that the power switch removes power from the whole machine. Continous memory means even when the switch is off the memory is still powered by the batter.
Thanks for sharing these memories from 70's! I made some screenshot of those cards, it is very exciting how you solved those functions in 50 steps. Runge Kutta's, Fourier, Impedances and root finder really a gem for me, thanks for sharing. I'll link your video, of course, if I use them somewhere. I really like to show people how minimal computing power is enough to solve really complex problems easily and for this the programmable calculators form 70's and 80's the best tools.
Thank you for your reply. Please share this video and screenshots as you see fit.
My first HP. I still love him today. 🥰🥰
The program cards are pieces of art
I like all HP RPN calculators I still have my hp 41c ❤
Nice presentation. I have a HP 25C. I bought it from a third party mail order company back in late 1976. I think their name was Electra or something like that. I was in tech school. I remember one of my instuctors said, the RPN made the easy problems hard and the hard problems easy. During the solid state class we did a lot of double power source problems. Also a lot of kirchoffs law. My HP25c worked a lot better than the TI's with algebraic notation. I made a program to make the display keep track of time. It worked like a clock. Function great. Thanks again. My HP25c still works also.
Thanks for your experience, nice to know that your HP-25C still works. I majored in Electrical and Computer Engineering back then.
Not non-cmos, non-continous memory. The tech inside is still cmos, it's just that the power switch removes power from the whole machine. Continous memory means even when the switch is off the memory is still powered by the batter.
That's very interesting to note. Thanks!