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on March 11, 2018
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How MOS 6502 Illegal Opcodes Work (2008)
I found the rearranged table of opcodes here [1] to help understand how instructions get decoded without getting in depth with the PLA dumps.
[1]
https://wiki.nesdev.com/w/index.php/CPU_unofficial_opcodes
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[1] https://wiki.nesdev.com/w/index.php/CPU_unofficial_opcodes