![]() Simply rotate the iPhone to switch between landscape and portrait keypads. MathU RPN for iPhone supports both a portrait and landscape keypad. Hex, oct, and bin conversions and bit manipulation functions.96 built-in functions (including 15 financial functions and 10 statistical functions).Integrated time value of money (TVM) financial functions that follow HP-12C conventions.Native application that runs directly on the iPhone (available exclusive via the AppStore).There are 20 memory registers.įull documentation for MathU RPN is available online (and accessible from the application). The calculator does all calculations with double precision accuracy and has 96 functions including 15 financial functions, 4 number bases and 10 statistical functions. MathU RPN is a Reverse Polish Notation (RPN) scientific and financial calculator for the iPhone and iPad running iOS 9.3 or higher. Solve math, engineering, and science problems.They have a good discussion forum as well. ![]() The Museum of HP Calculators site has everything you ever wanted to know too: :o) My recommendation is to pick up something modern such as a 35S and (if you need a grapher) a 48 series machine now for a price you can afford and save up for buying some vintage stuff. If you have become hooked, as I have, your collection will definitely grow. Honestly, all you need is a good place to start. You can buy replacement batteries from several places, but even with a new battery that gorgeous LED display is power hungry over a long session compared to what we're used to. Make sure you get one that comes with the wall wart though. I've seen decent looking ones for well under $100 on fleabay. The best thing, however, is that 45s are considerably less collectible than 35s so the prices are not stupid. It has registers to save and recall numbers but no programmability. It's basically an HP-35 with more features and is firmly in the "electronic slide rule" era. If you're itching for a truly classic LED bubble display machine, consider looking for an HP-45. It does have the advantage of being _much_ faster than the original Nut processor since it's instead running emulated Nut code on a fairly fast part. There's also the 15C reissue out there, but these seem to go for stupid money. The 11C might be more attainable but it doesn't have all the features the 15C has, which is worth considering. I brought them home due to extended work-from-home. In non-coronavirus times the second one and my second HP-16C live at the office. Unfortunately, the cheaper ones you see listed on fleabay may be over the hill a bit in terms of condition. ![]() Vintage scientific option: well, it might blow your budget but the HP-15C is one sweet calculator if you can find one. It's keystroke programmable too, so you can have that weapon in your toolbox. Probably has the best keys of anything modern HP is making (though it's not as good as the keys on the older machines). I use it less now that I have a collection of older HP calculators, but it still works great. This and my HP-50g got me through all my schooling. Modern scientific option: HP-35S hands down. I, too, can attest that it is nearly impossible to go back. Anyway, just my $0.02 for what it’s worth.Ĭongratulations on discovering the wonderfulness that is RPN. So, if you want a great RPN experience, ANY other RPN calculator from HP is wonderful. I’m sure it’s a wonderful calculator when NOT in RPN mode, but non-RPN calcs don’t personally interest me, thus I sent it back. I sort of recall feeling like the RPN feature was an after-thought on the calculator, or awkwardly bolted on, or that HP deviated from some the important design decisions that they employ on all their other RPN calculators - anyway along those lines. Sorry, at the moment those details are escaping me. It was quite a while ago, so I wish I could remember the details that got me to the point that I decided to return it AND pay the HP restocking fee. I eagerly dug in but I ended up hating it after playing with it for a day or two. I was so excited when I got mine delivered to me direct from HP. I have a bunch and really wanted, and expected to, love the Prime. ![]() ![]() If RPN is key, then IMHO, shy away from the HP Prime. ![]()
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