mc68010+mc68451 Unix source?

Eric Smith spacewar at
Wed Oct 5 03:15:50 CDT 2016

On Tue, Oct 4, 2016 at 3:14 PM, Al Kossow <aek at> wrote:
> no. the 68451 is a segmented mmu, so you wouldn't use it for demand
> paging. the normal way you use it in unix is setting up segents for
> text, data, and bss

On Tue, Oct 4, 2016 at 9:28 PM, Ian S. King <isking at> wrote:
> I remember reading the spec sheets for a MMU of that type - for the 6809!
> That was one versatile little processor.

I've never heard of a segmented MMU for the 6809.  The MC6829 MMU was
paged, using 2KB pages.

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