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On this Day in 1981: Launch of the Sinclair ZX81

Lisa Miles
Okay, own up.... Who had a Sinclair ZX81 and what was the first thing you programmed on it...? ? Keyboard
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    Oh yes, I soldered mine together from the kit - £50 as I recall. I think I got the resistor networks back to front, but it still worked, with its 1K of RAM. Still have it, and I think it might still work! I used it to calculate the coefficients of a chebyshev filter for an audio crossover - a real use!. Rather simplified as it kept running out of memory. Oh the pain...the pain
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    Oh yes, I soldered mine together from the kit - £50 as I recall. I think I got the resistor networks back to front, but it still worked, with its 1K of RAM. Still have it, and I think it might still work! I used it to calculate the coefficients of a chebyshev filter for an audio crossover - a real use!. Rather simplified as it kept running out of memory. Oh the pain...the pain
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