Any specific period in time? Message #2 Posted by Vieira, Luiz C. (Brazil) on 2 Dec 2004, 4:59 a.m., in response to message #1 by Martin
Hi, Martin;
I'm adding this question because at a certain point, just a few HP calculators since the HP35 were not RPN only. If I am not wrong, only after the Voyagers that HP offered pocket algebraic calculators. If we consider the earlier desktop models (HP9xxx), the initial page at the MoHPC counts the story: 9100A/B and 9810A being first and second generation RPN models, 9830A being also programmable in BASIC (algebraic operation to follow the programming language or viceversa?), 9805 an algebraic statistics, the HP9815A/B being the third generation RPN and so on.
Except for the "adding machine" HP10 and the wrist watch HP01, all of these "species" are RPN: the Classic models (HP45, 35, 80, 70, 65, etc), Woodstock series (67, 97, 21, 22, 25...), the Spice series (HP31E, 32E, 33E/C, 34C, 37E and 38E/C), the HP41 (all models) and the voyager series (HP10C, 11C, 12C, 15C and 16C).
Some pocket/portable models are not RPN, but I believe they are taken as handheld computers, like the HP75C/D (series 80 portable with LCD), the HP71B and the HP94, being these BASIC machines (although BASIC is a programmable language and not necessarily a keystroke user interface; you can use the HP71 or the HP57 as an algebraic calculator without the need for programming, right?)
Both the HP18C (financial algebraic) and the HP28C (RPN, scientific) introduced the RPL platform, and after these ones we had the Pioneers, with some interesting algebraic models, like the scientific models HP20S, HP22S, HP27S (do everything, like its predecessor, the HP27) and financial models like the HP10B, HP14B, HP17B and HP19B. The RPN pioneers are the HP32S, 32SII (with algebraic expression capabilities) and the HP42S.
Although the HP28C/S and the HP48 series allow algebraic expression evaluation, they are essentially RPL models, considered by HP as the evolution from RPN (I bought that idea) while some RPN users do not accept it as truth (I respect them, some points are valid).
There are also the HP38G, 39G and 40G, all algebraicmodels.
Anyway, after these ones, a mix of "RPN/Algebric selectable" models became available: the financial models HP19BII, HP17BII, HP12C Platinum and the scientific models HP33S and the HP49G/G+. These units perform either RPN or algebraic operations as the user wishes to.
Well, I wrote about 90% of this by heart, I read a bit about the desktop series I'm not familiar with and the earlier Pioneer algebraic units, so I accept the possibility of adding wrong, not accurate info and missing some particular model, sorry! If I have the time to correct any existing errors, I'll do that prior to additional posts.
Hope this gives you a glimpse...
Cheers.
Luiz (Brazil)
Edited: 2 Dec 2004, 12:50 p.m.
