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Re:6502 “Illegal” Opcodes Demystified by wruza on Sunday June 06, 2021 @08:51AM (#27412811)
That was my first thought when seeing what these opcodes do. Just a result of a random mix of various parts of cpu in action. Thanks for confirming it!
Re:6502 “Illegal” Opcodes Demystified by masswerk on Sunday June 06, 2021 @09:06AM (#27412883)
This is also, what this article is actually about. It's just from a more "hermeneutic" perspective, rather than a bottom-up approach based on an analysis of the hardware.