Shirriff’s Sinclair Scientific simulator

Ken Shirriff has reverse engineered the Sinclair Scientific, an incredible 12-function scientific calculator made by Sinclair Radionics in 1974. (I got the picture on the left from here.) He reports the details here. According to his August 30, 2013 blog post:

I’ve reverse-engineered the Sinclair Scientific calculator. The remarkable thing about this calculator is they took a simple 4-function calculator chip and reprogrammed its 320-instruction ROM to be a full scientific calculator. By looking at the chip, I’ve extracted the original code, reverse-engineered how it works, and written a JavaScript simulator that runs the original code and shows what the calculator is doing internally.


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