SR-50: A bumpy road??

[Johnh]

There's a point at which lack of calculator accuracy really does impact our confidence about the result, and I had that Sinclair Scientific from 1974. I think I got it for 20 pounds, in 1975. It was neat and fun, but not actually much use, even at high school. Those trig functions, took about 15 seconds to get 3 figures, and I could read four-figure tables quicker than that. But by 1977 I had a Commodore SR1800, made in 1976 that had all the basic scientific functions needed at 12 digits internal precision, and a very functional ,reliable and economucal build. A massive development in accessibility and affordability since the hp35 lead the way just 3 years earlier.