[TUHS] v6tar from v7 on v6, too large?

[Ronald Natalie]

> 
> Aside: V6 comes in two flavours: no split I+D at all, or split I+D in both
> the kernel and user. For some reason that I can't recall, we actually
> produced an 'm43.s', BITD at MIT, which ran the kernel in non-split-I-D, but
> supported split I-D for the users.

I’m pretty sure the V6 kernel didn’t run in split I/D.   It supported three user a.out formats:   407 (mixed I&D in one instructions space),
410 (mixed I&D but with the instructions in write protected segments), and 411 (split I&D).

It wasn’t too involved of a change to make a split I/D kernel.    Mike Muuss and his crew at JHU did it.   We spent more time getting the bootstrap to work than anything else I recall.
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