Why not protect the addresss space for the ROM?  Or shadow that rom
address block.  (aproximatly what I was saying before)

What about making a "broken" kernel that would "block" the use of those
ROM addresses by the MMU?

Seems logical unless DEC broke something...  Though I may be breaking
the bounds of "protected-mode"ness.

JS


Dave McGuire wrote:
> 
>   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.