If I were to buy an LED model...

[DaveBr]

(11-15-2019 01:43 AM)Dave Britten Wrote:  Update!

I bought a very nice 25 from DaveBr, with the case, manual, and applications book. I've been tinkering with it off and on all afternoon/evening, trying out various programs from the books and such. It's really impressive how much you can do with just 49 steps, and no subroutines or indirect addressing. Yes, you can do more with a 42S, but you can still do a lot with a 25.

I got a set of 4 flat-top NiMHs from Batteries Plus, so I can have two ready to go if I need to throw the current pair on the charger. They seem to fit well in the little 3D-printed battery pack.

I didn't realize how tiny the Woodstocks are. My TI-58C looks gigantic next to it.

I was able to write the usual mod 30 prime factor finder on it, but without subroutines, you instead have to build a loop that strips digits off of a "stream" of offsets stored as .2122 and .42424626, and it ends up being slower than just testing all the odd numbers.

I still plan to keep an eye out for an 80, and maybe a Spice too.

I’m happy to hear that the HP-25 arrived and you are already writing programs on it. The HP-25 was my “go to’ calculator for years and I can’t even count the number of programs I wrote on it to solve both work and home problems.
I have an HP-80 and it is a wonderful financial calculator. I use it often for personal finance. I have a number of HP financial calculators, but I prefer the HP-80. There is something deeply satisfying watching the blinking LEDs while it works out a solution.