Vintage Calculators

My first mechanical calculator

My first electronic calculator

Early programmable calculator (TI SR56)Late hand driven mechanical calculator (Brunsviga 13RM)
Currently in repair

Recently added calculators

Last update

It all started with this little programmable SR56 calculator.  I bought it in 1976, build a small program for it and became a Philips software engineer one year later.

In 2013 I was cleaning my attic and found it.  The first idea was to sell it.

I didn’t …………

Looking on the internet what would be a reasonable selling price for the SR56 I ran into the above  small mechanical calculator.

What I found on the internet regarding this and other machines was very interesting.  So, I bought it ..... and another one and a more complex one …………

Late mechanical calculator (Friden SBT10)

How Semiconductors Changed The World

About 1970 the world of calculating machines rapidly changed from mechanical

 to electronic.  Using a slide rule  most of the time and electronic calculators not being allowed at school, I wasn’t aware at all of the changes that took place.

Now I consider it my mission to setup a small collection of well preserved and operational calculators which are representative for the changes that took place in that period.


Added Marchant 8ADX


Soemtron 215 minor repair


Added Monroe 8N-213

Update history

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Vintage-Calculators Casio FX-7000G

Casio FX-7000G

Monroe 8N-213

Monroe 8N-213

Marchant 8ADX

Marchant 8ADX

Walther EMKD

Walther EMKD

This small printer, a TI PC100A,  fits the above SR56 calculator.  I found the printer on Ebay.  It’s in mint condition, but when tested didn’t show any response.

When I opened it and switched the power on, I noticed a little bit of smoke coming fro one of the transistors.

On the internet some information is available  regarding the electronics.  With the help of that info I hope to be able to repair it.