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I love my TI89 Titanium, but my 1st scientific was an HP15C. I love the reverse polish notation of the HP's. I found this HP48GX at a flea market in my hometown this week for 25$. Price on Amazon? $150.00 !!!!!

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I don't remember exactly which calculator I first had but it was very much like this and my "big" Christmas present in mid 1970s this is the HP-35 Calculator from 1972. Look at the cost! It is still my favourite calculator of all time. Great keyboard, and used Reverse Polish notation logic for entry, which seemed so logical.

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HP 80, RPN, reverse polish notation, better system if you think about it. 5 hit enter, 2, then operation +, and answer 7 is displayed

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HP 12C Financial Calculator HP 12C Financial Calculator The HP 12C Financial Calculator features built-in financial functions and statistics, uses Reverse Polish Notation (RPN), more than 120 built-in functions, including register-based cash-flow analysis, 10-character, 1-line LCD display, Device measures 5.0 x 0.6 x 3.1 inches (WxHxD).It has 10-character, 1-line LCD display. http://www.newofficestore.com/hp-12c-financial-calculator-3/

How to turn the Mac Calculator app into RPN (Reverse Polish Notation) mode, like a classic HP calculator...

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