Thanks, BigEd! I actually spent the last two weeks optimizing and performance has improved by a factor of 4. So instead of 13 seconds to run the test suite, it takes about 2 and a half. I'm still nowhere near lib6502 but I'm gonna take a break for a few weeks. At 762 lines, I think I've at least got ...

I guess it's about time I made my first post. I'm the author of cl-6502[0].
@Klaus: Your test suite is fantastic. Thank you so much for making it. It made my life much easier as someone new to hardware emulation.

I've successfully run the tests (with decimal mode disabled) on lib6502[1] after a ...