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

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