[henry_bone]

I wonder if it's correct right down to the errata. Was there undocumented instructions on the 6502? If so, I wonder if it supports those.

[zik]

Yes, there are some undocumented instructions [1]. They say it's a transistor-for-transistor replica so it should be 100% compatible with them.

[1] https://www.masswerk.at/nowgobang/2021/6502-illegal-opcodes