For anyone looking for an MMU for this CPU core i've reimplemented the MEMC from the Archimedes A540 and verified it with the RISC OS 3 Post tests. It gives up to 16MB of RAM but has all the pains of the original Acorn MMU. Available from me at my open cores email address on request.
I aim to publish it as a core for MiST before too long.
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