Reverse Polish Notation (RPN) Calculators

I miss my HP-15c. Lost it in a lecture hall

Anyway you can download RPN calculator apps on iOS and Android for free or small charge.
Just do a search.

I am sure that HP still makes them. They are the only manufacturer still making it.

I don't think any are available at the price you're looking at. There is the HP 35s which is a scientific calculator and is RPN it's around $69. Oddly enough my old one from school is dead, I can't seem to figure out why. It looks brand new but won't even power on.

I still use my HP 12c at work and I have a backup in a HP 17 calculator for home. Don't get a 12c Platinum as the feel of the buttons is supposed to be off.

The HP calculators last forever. I'm sure my HP48G still works(hadn't use it in years). Did you try to replace the battery?

Sum_guy wrote: ↑I don't think any are available at the price you're looking at. There is the HP 35s which is a scientific calculator and is RPN it's around $69. Oddly enough my old one from school is dead, I can't seem to figure out why. It looks brand new but won't even power on.

I still use my HP 12c at work and I have a backup in a HP 17 calculator for home. Don't get a 12c Platinum as the feel of the buttons is supposed to be off.

happyplato wrote: ↑The HP calculators last forever. I'm sure my HP48G still works(hadn't use it in years). Did you try to replace the battery?

I'm going test the batteries I bought, one of them might be bad. My 48SX still works and it's older. The 32S should work as it looks in perfect condition.

/just realized I have too many HP calculators: 48SX, 32S II, 12c, 17Bii+, 10b

I have 28S from the late 80's. Ahhh the good old days of RPN! I remember it cost over $200! Too bad it's worth nothing now.

Still works.....or at least it did when I changed the batteries 5 years ago. I'd change the batteries again but have no real use for the calculator anymore, plus it takes 3x type N batteries (not cheap).

Ah, the days when HP actually made good stuff. Those 80's calculators were bulletproof. It was like buying the Porsche of calculators, they were aspirational

singhrh wrote: ↑I have 28S from the late 80's. Ahhh the good old days of RPN! I remember it cost over $200! Too bad it's worth nothing now.

Still works.....or at least it did when I changed the batteries 5 years ago. I'd change the batteries again but have no real use for the calculator anymore, plus it takes 3x type N batteries (not cheap).

Same here, still have my 28S from 1990. I once coded a "Tetris" game into it using its scripting language and about 2500 characters of manual data entry, copied from some insttructions on a BBS. Lolz, it was about 0.5 fps redraw.

Still works, I still use it about once a month when I'm doing my bills and such.

The thread reminded me of my old 80's HP 15c... I turned it on & it still works in its original batteries.

There's a free RPN calculator app being given away in the Amazon App Store for the next couple of days: http://www.amazon.com/Scientific-Financ ... B004UO0SAO

I remember the first HP RPN calculators fondly. A friend of mine brought an HP-35 to school one day for a math exam, borrowed from his father, a government scientist. This was back when it was the very first of its kind, and they cost something like $500. Everyone was impressed. The teachers didn't know what to do about it. I could never afford one of my own though. I still have a functional TI-50, the first affordable scientific calculator for students. It coast about $150.