View Full Version : HP 35s Scientific Calculator

06-01-2010, 9:24 AM
Saw this in Fry's, $55, and got it. Looks a bit like a 41, and has RPN. I think they made a mistake making the area around the display aluminum, it'll get all dinged up like the 10-series calcs do.

Heck you can't find a decent 41 for less than $200 these days, they stopped making them long ago. And those N batteries can get expensive. This runs on a couple little button batteries.

I think it's a win.

06-01-2010, 9:54 PM
I love RPN!

06-01-2010, 11:49 PM
Yeah RPN is what sold me on this.

If you ever find a 42S, those are a collector's item, worth a couple hundred bucks on ebay.

06-02-2010, 7:03 AM


I love my 48GX!!


06-02-2010, 9:11 PM
The 48's are great but ..... I love this little calk. I don't need graphing but it's sure nice to be able to assign a variable, set up a little program, etc just like on the 41. This is a far better retro-41 calc than the 42S and for $55 geeze, if you're a scientist or engineer, you can't not get one.

06-02-2010, 10:07 PM
I own a TI killer, i.e. the HP48GX too, it's a great calculator.
Last weekend I went to staples because I needed a simple scientific calculator for the shop. I was surprised to have zero'ed in on a Casio FX-300MS and it was only $10!!!
But I will always have a place in my heart for my very first calculator, the Casio FX-82 which I have owned for 24 years, and it's still on its first set of Casio AA batteries!




06-03-2010, 12:16 PM
I sold a HP41c on ebay a few years back and I had no idea these things had a collector cult.
Mine had a large and small case, printer, memory modules, books, templates to lay over it and a bunch of other stuff, what shocked me the most was I got over 300.00 for it. :eek:

06-13-2010, 12:30 AM
They got a steal of a deal too.

06-13-2010, 2:19 PM
Greetings, fellow calculator geeks.

I grew doing my first programming on TI58 and HP41 calculators. Got interested in how transcendentals were really calculated [it's not the way your high-school calculus teacher would do] via CORDIC/shift-and-add methods.

I love old-school RPN (4-level XYZT+L stack). I hate the 28/48s "deep" stack and RPL. I had a 48 for one week in the 1990s and gave it away.

HP41C(/V/X) and HP42S were the pinnacle of calculator development IMHO. Fortunately I have a couple plus 11C/15C/16C and some LED collectibles.

By the time 48s rolled around there's little need for that calculating power inn the hand: if you're solving symbolic or "big" math problems, you'll be at your desk on a PC using Maple, Matlab, etc.

The 35S generally does nicely for a new RPN calculator with a large ENTER key. Some other keyboard layout things I don't like but can live with. The programming model needs to be more 42S like - programs you do on calculators these days are more "key macros" than 'big programming".

06-13-2010, 9:39 PM
Current functional calculators:


06-15-2010, 12:07 PM
the Museum Of HP Calculators (MoHPC) site is the ultimate HP calc geek-out site.

Maltese Falcon
06-15-2010, 12:13 PM
I have a super duty HP calc that my nephew "found", don't know the model #, gave him $20 for spending cash 5 years ago to take it off his hands.

I'm gonna have to dig it up and see if it is one of these "python" models..:)


06-17-2010, 12:14 AM
Orphan HP's are the best!

I traded my Commodore-64 for my HP-41C

06-17-2010, 12:32 AM
the Museum Of HP Calculators (MoHPC) site is the ultimate HP calc geek-out site.

MoHPC member Eric Smith - Bay Area resident who wrote various HP calculator microcode emulators - is a great guy and pro-gun/pro-liberty.

Lessee - what classic calcs do I have?

3 x HP25/C (one needs repair)
HP91 desktop sci calc
HP97 desktop prog calc (needs a bit of work)
3 x HP41 + 1 for parts.
Rockwell desktop scientific
Rockwell handheld scientific (VFD display)
2 x Sharp small desktop printing sci calcs
2 x Casio CM100 "computer math calc"

06-17-2010, 4:47 PM


Exile Machine
06-17-2010, 5:06 PM
At one time I owned nearly every HP scientific calculator produced. Hardest to find was the HP-10C. I used to scour thrift stores around Austin to pick them up for a few bucks apiece. My favorites were the red LED units, the original HP-35, HP-55, HP-80, 67/97. Was a card carrying member of the Personal Programming Center, even wrote some articles for the PPC Journal. Still have a PPC ROM, once had a carton full of PPC ROM Manuals (as big as a phone book). Now you can get all the journals and the PPC ROM manual on DVD.

First machine I ever programmed was a TI-55 / red LED variety. TI quality at the time gave you multiple digits per keypress. Garbage. Quickly graduated to the 41CX in late 83.

The part of HP that made the calculators I think is now called Agilent. The current crop of HP calculators after the Agilent split, I don't know who's doing that but it's not the same quality.

RPN rules.


06-17-2010, 6:13 PM


Nerds rule! I have a HP 33E and currently still use my HP32SII. I remember using my college roommate's programmable HP calculator to solve a really tough Bayesian statistics problem, so that even my Professor was impressed.

I can't find my K&E slide rule. When I went the college, the calculator age just started. No calculators, cell phones, no voice mail, no fax machines, no internet, no personal computers, and worse of all, Glocks were not invented by Glaston Glock yet. We wrote computer programs on punch cards using keypunch machines and carried our computer programs in boxes of 2,000 punch cards.

06-17-2010, 8:51 PM
I still have my HP 32e that I used in high school and part of college. The battery pack died and it was only usable with the adapter plugged in. I was offered some money for it ( $40) and I wondered why someone would want a dead calculator with LED display. My HP 32s is what I use now.

06-17-2010, 10:41 PM
NERD?I'll show you nerd. I'm a Wramblin" Wreck from Georgia Tech, and I carried this from my belt for 4 years. 1968 model 1460 and original case. I also have and daily carry (Concealed, of course) the 5" little brother VersaLog. People freak out when they see it in operation.

06-18-2010, 12:35 AM
OK, we're onto slide rules now.

I was in 7th grade (1977ish) and before I got a 'good' calculator my dad made me learn how to use a slide rule.

So I had a $2 one, 6" from Borden plastics, I got from Walgreens. Then Pops bought me a a nice Teledyne Post coated bamboo one.
Later at flea markets (after total calculator takeover) I picked up two of those nice Pickett alum. sliderules.

I still have all of 'em today. I should freak people out at work and bring one to a meeting when I'm the dude that has to run numbers.

06-18-2010, 1:22 PM

Why thank you! :)

Remember, all the cool girls go for the jocks in high school, but after that, they come to us.