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The Strange Case of the Rogue HP-12c Calculator
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My ignorance came to a halt due to an unfortunate combination of my fixed-rate mortgage period ending and Liz Truss happening, and I was driven to a sudden keen interest in the ‘time value of money’ (TVM) calculation. With the help of many from the HP museum and Swiss micros forums, I set about testing as many financial calculators as I could find, learning a lot about their design in the process. Thank you so much to my Brazilian friend who tirelessly worked with me across the Atlantic to test the rogue HP-12c and who eventually, in a cross-continental trust exercise, allowed me to order them another calculator, while relinquishing their own so I could get my hands on the real thing.
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