What should be my next LED HP calculator?

[Valentin Albillo]

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Hi, Trond:

(06-05-2020 02:10 PM)Trond Wrote:  So which one is the next LED calculator I should be on the lookout for?

First of all, welcome to the MoHPC fora, you're bound for a very nice experience here.

As for your question, may I suggest the three following models:

1) HP-25C: (the non-C version is pictured below):



A wonderful little machine, reasonably inexpensive even on auction sites, which is a pleasure to use. See the wonders it can do here (7-page PDF document): Long Live the HP-25 !

If possible, get the HP-25C version instead of the original HP-25, as it'll keep your programs intact while turned off, saving a lot of keystrokes and hassle.


2) HP-29C:



Exactly same form factor as the HP-25C but much more capable: twice as much program memory (98 steps), 30 storage registers instead of just 8, subroutines (at long last !!), indirection, loops, labels, insert/delete program steps and other goodies.

Probably harder to find and more expensive but honestly quite worth it. It was my dream machine at the time of its release. There's also a functionally identical but printing vesion, the HP-19C, but that one is really hard to find in good shape and usually much more expensive.


3) HP-55:



A classic machine that oozes quality. It has many data registers (20), lots of mathematical and conversion functions, 49 (mostly unmerged) program steps, and a unique feature: an accurate quartz-based chronometer with 0.01 sec. resolution and the ability to take up to 10 splits while running, which can later be recalled and operated upon with the also available time-related functions.

Happy choice !

V.