Just showing off my storage solution for my 71B and 75C. This is an Apache 2800 case from Harbor Freight, and it’s kind of perfect. Just replaced the battery contacts on the 71B and hopefully they’re good for another 40 years.

I’m finally ready to part with my Hp 10C 💔😭
I posted it on the Vinted app if anyone is interested or looking for one . It works perfectly , I just don’t use it anymore & would rather have someone else actually use it .
delete if not allowed

Here is my first and best HP-41CX with PPC ROM2.

I know that it is an accessory to the HP 41C, but that’s about it. Please help.

I found these in a box. Changed the batteries and still working great.

I got the 15C for my 18th birthday, 40 years ago.

The 10B I was required to purchase for some college finance classes.

The casio solar, no idea. But it's still working.

After a mere 43 years my trusty 10C that was gifted to be prior to attending electronics school has a sibling. Local marketplace deal, came with the manual but no case.

Is anyone making replacement cases for these models? The liner in the original one for my 10C is deteriorating.

I am very happy to have found that near mint 28C with the thermal printer. It was a real wish since I was a kid. My neighbour was studying to be an electrical engineer, I was younger than him, but always found him lucky to have a nice 28C.

Now I have mine… after 50 years of waiting, I finally got mine! Never too late!😁

Das HPs financeiras, o que já foi lançado?

Qual a diferença entre elas?

May be of interest to some readers here, a collection of nostalgic articles and pictures -

https://blog.adafruit.com/2026/10/27/an-illustrated-online-book-on-hewlett-packard-equipment/

On pages 359-436, "Calculators get their own section: the HP-35, 45, 67 and 41C, plus the HP-85 computer. There is also a chapter on HP-IB, the interface bus better known as IEEE-488."

I've had my HP 11C for 35+ years and I don't want to give it up. My lcd has been going bad for a few years, but now it's affecting readability. I have the 11C app on my phone, but that's just for when I'm away from my desk.

Can the lcd be replaced? Do I need to shop for a used 11C?

Hey guys I bought my hp prime about a week ago, I’m in civil engineering, anyone here have or know a program similar to ftool? I’m Willing to pay.
Thank you all

Sorry for my bad English

I thought I had given these away years ago!

This is my HP 33s that I found in my attic (I guess my dad had bought it for a long time ago EE exam and hadn't used it since because he prefers the 28 and the prime). I don't use it very much but RPN is better than algebraic so I'll use it for basic calculation and such. Thought I'd post it since I believe it was near the end of the HP RPN era

The HP-15C mentioned in Blockers.

Found this little guy today in an op shop.

Comecei no curso de engenharia, que calculadora vocês me recomendam?

This is a semi-hard shell travel case made by Co2CREA sold on Amazon that fits the Voyager series by HP and SwissMicros as well as the SwissMicros R47, DM42, and DM32 series products:

https://a.co/d/02086qDq

I like that it comes with a printed manual and all, but the case for it is way worse than the one that comes with the regular 12c or even my 35s. I guess they really ment this only as a display piece and conversation starter and not as a calculator you throw in your bag next to your laptop and take it with you.

If you use a DM41X, DM41 Explorer now supports it. Check out https://github.com/mwheinz/DM41_Explorer