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 regarding this and other machines was very interesting. So, I bought it ..... and another one and a more complex one …………
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.
Brunsviga 16E Improved electric diagrams
Improved version of Friden SBT10 key functions (see assets)
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Next months will be devoted to maintenance. The collection I built isn’t large, but all calculators were fully operational at some point and that’s the way I would like to keep them. Machines which have been repaired several years ago might be blocked again and need some further cleaning and lubrication to remain operational.
The electronic calculators provided with rechargeable batteries are checked every few months. They are all equipped with modern low self-discharging batteries. An occasional recharge is sufficient to keep them operational.
|General Repair Info|
|Bohn Contex 55|
|Friden EC 1117|
|Hamann Manus R|
|LLoyds Accumatic 55|
|LLoyds Accumatic 100|
|MBO TRS 1300P|
|TI SR56 & PC100A|