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

Ronald Natalie ron at ronnatalie.com
Wed Dec 9 21:31:39 AEST 2015

> 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.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 2284 bytes
Desc: not available
URL: <http://minnie.tuhs.org/pipermail/tuhs/attachments/20151209/e4f44d30/attachment.bin>

More information about the TUHS mailing list