Worth linking the comprehensive modern reverse-engineered documentation of the illegal instructions: "No More secrets: NMOS 6510 unintended opcodes". This runs

Worth linking the comprehensive modern reverse-engineered documentation of the illegal instructions: "No More secrets: NMOS 6510 unintended opcodes". This runs to 119 pages including detailed analysis of each opcode, any instabilities, and potential use cases. [1] https://csdb.dk/release/download.php?id=305221 https://csdb.dk/release/download.php?id=305221