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What calculator do you use ?
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gildasd:

--- Quote from: alsetalokin4017 on July 06, 2015, 01:40:35 am ---Sharp EL-520W

--- End quote ---
It's 2 gen old version of the international Casio Fx82...
Think 20 year old tech...
The non educational version is now the 995:

That can be put in "linear mode" for those VPAM hatters ;)

Edit:
Casio still sells in Japan the 20 year old version!
casio.jp/dentaku/product_list/products/?m_no=338
MarkF:
I've had a HP-22S for many years.  It's NOT RPN.  I don't know if they ever made a newer version to replace it.
HighVoltage:

--- Quote from: MarkF on July 06, 2015, 09:49:42 am ---I've had a HP-22S for many years.  It's NOT RPN.  I don't know if they ever made a newer version to replace it.

--- End quote ---
I am pretty sure there was only one version of the HP-22S
Here is a picture of the one I have with serial number: 3038S06339

This one and the HP-32SII are always on my engineering table.
For some calculations I prefer the RPN and for others I take the normal route with the 22S.
VK3DRB:
My first scientific calculator, used in HSC (Form 6, or now called year 12) in 1976. It was cheap at the time - today's equivalent of about $800. Quite collectible these days and very, very rare. Also sold under "Abatron 808". Apparently it was developed in 1973, which I doubt.

The Farad was unique to Australia because it was badge engineered by Farad Trading Pty Ptd in Balaclava in Melbourne, Australia but was actually made in Hong Kong.

Four buttons have discoloured over the years, but others have not. I don't know why.

The calculator came with two 80mAh nickel cadmium rechargeable batteries at a time when rechargeable batteries were almost unheard of. Those batteries lasted up until 1998, a remarkable 22 years.

I still use this calculator! Although I prefer RealCalc on the Android phone for general use.
ccs46:
I use a TI Voyage 200, for both my school work and my hobby as well.  Has a big display for the long equations, or playing Snake or Tetris in Geometry while the Sub yaks away.  :-DD
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