> To clarify, if MXU is present (a cpu defined to have MXU instructions is > selected) we will never run any of the other special2 commands? That would > actually simplify the implementation.
If presence of "special2_legacy" instructions and presence of MXU instructions are mutually exclusive (and I believe they are (why would they occupy the same opcode space unless they exclude each other?), but at this time don't have enough CPU documentation materials to 100% confirm that), I think this is the way to go. Thanks, Aleksandar