Old calculators...
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And I keep my Casio fx-4000p in my backpack for just such an occasion as I need a scientific calculator. I bought this thing sometime in the mid-80's although I may have replaced the battery once, I can't remember doing so (but I did write the battery number (cr2032) on the back sometime in the past). I've even had one of the students come scurrying in asking if anybody had a calculator they could borrow for a test (I'm a univ. research asst.) Must be the Boy Scout motto showing in my behavior ;-) Way
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Long time lurker - first post here. I have an old ca 1966 Canon 161 electronic calculator that I restored to operational condition this last weekend. No "chips" - something like 788 germanium transistors and over 2000 diodes on a stack of 11 9x12 inch boards. The display consists of layers of clear plastic slides that are side-lit by small incandescent lamps. Takes almost one second to do a divide operation. Some of the digits flicker while it is doing this. Fun old machine! There is an example of one here: http://oldcalculatormuseum.com/canon161.html[^] I have also an HP-15C that I bought in 1983 - 4th set of batteries, I think... - Oren