Recently rediscovered…

…at the back of a cupboard, the Casio fx-550 calculator that got me through my O- and A-Levels. I think this replaced a Texas Instruments TI-30 that eventually died.

I think it must be close to forty years old, though I’ve almost certainly not used it since I finished my degree. It still appears to power on, though it looks like a new battery might be required.

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