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Description
I have now run a 6502 instruction test suite on my Acorn Atom simulator which uses code from this repo. It reported a problem with the ADC instruction, and manual analysis suggested that it was the carry bit which was mis-calculated.
I modified the code to re-calculate the carry bit only. The testsuite then ran until I stopped it. Also the Acorn Atom simulator now behaved 100% normally (as much as simple testing can show).