Memory Management Unit.  It's what maps virtual addresses to
physical addresses, handles the low-level parts of paging, makes
processes base addresses look like they start at (or about) zero,
protects areas of memory, stuff like that.

         -Dave

On February 12, Jacob H. Suter wrote:
> Please excuse my ignorance, but whats the MMU?
> 
> Thanks,
> JS
> 
> >   Ragge has mentioned that, at least on the MicroVAX II, the ROM character
> > output routines only work with the MMU turned off.  Someone (Bertram?) talked
> > about a hack to disable the MMU, print a character, and turn it back on again.
> > I don't know how far that got.