@amigarobbo
nope MMU is used for 'paging' memory to and fro from the hard disk and since Workbench doesn't page memory (from previous discussion/thread VMU for the Amiga is a trick and does not actually use the MMU) so for 99.5% of Amiga an MMU is pretty worthless....
Debian Linux on the other hand is in fact, like 99% of flavor's of linux, is a paging Operating system and hence the MMU is actually used.
However it would only be fair to say that I am sure there was a programm on the Amiga that actually did make use of the MMU ( i cannot remember what it was now) as well as the jury still being out on If the SCSI controller makes use of the MMU in some way.... hmmmies....
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