I think they might have been there for some other reason and then was used for Inferno, which they somewhat had going on a Palm Pilot in some form (not necessarily as the native kernel).
If I waded through a ton of archive material I could probably find the latter, to see what it was, but I'm not sure it's really worthwhile now.

On Wed, Feb 24, 2021 at 8:16 PM Joseph Stewart <joseph.stewart@gmail.com> wrote:
Charles could probably answer this better than me, but weren't the 68k
compilers made to support Inferno?
-joe

On Mon, Feb 22, 2021 at 11:18 PM <rt9f.3141@gmail.com> wrote:
>
> Hello,
>
> I'm wondering about the history of the 68000 compiler/tools.  Support for the 68020 makes sense, it had an MMU, but 68000 did not.  And it had some design flaws that prevented it from working correctly with the external MMU, the 68451.  So why does/did Plan 9 have a 68000 compiler?  Did Plan 9 ever run on an MMU-less 68000?
>
> thx.
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