Vintage Calculators

My first mechanical calculator

My first electronic calculator

Early programmable calculator (TI SR56)Late hand driven mechanical calculator (Brunsviga 13RM)Diehl Transmatic V12

The Diehl Transmatic (small picture bottom-left) is back on the work bench. It slowly starts working.  However, multiplication involves a toothed belt which drives the multiplication register. Time has deteriorated the original belt to dust.  The pitch is one that I did not find yet in web stores. So it might be impossible to fully repair this machine.

Currently in repair
Marchant ADX

Recently added calculators

Last update

It all started with this little programmable 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 Facit CA1-13 handboek (Dutch)


Added Brunsviga 11E manual


Added Casio FX-7000G

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Vintage-Calculators Casio FX-7000G

Casio FX-7000G



LLoyds Accumatic 55

Lloyds Accumatic 55

Marchant 8CMR

Marchant 8 CMR