frank@phoenix.owl.de (Frank Wille) writes:

>I guess it gets into trouble when running into a bus-fault (MMU-exception)
>while executing CAS. I don't know if the exception handler is prepared to
>emulate the entire read-modify-write cycle of this instruction?

The 68020 (unlike the 68040) is supposed to rerun the complete instruction.

-- 
-- 
                                Michael van Elst
Internet: mlelstv@serpens.de
                                "A potential Snark may lurk in every tree."