Subject: Re: PMMU & 40 MB HD(was: IDE Support...)
To: Mattias Andersson <mattias.andersson@mailbox.swipnet.se>
From: Bill Studenmund <wrstuden@loki.stanford.edu>
List: port-mac68k
Date: 03/11/1998 10:57:39
On Tue, 10 Mar 1998, Mattias Andersson wrote:

> Colin Wood wrote:
> > > I_ve serious plans to ask for the MC68882 PMMU for my Mac II to be ab=
le
> > > to run NetBSD
> > > 1.3! Does 1.1 work without a PMMU?
> >=20
> > No.  NetBSD/mac68k has _always_ required a PMMU on the Mac II.
>=20
> But on the info sites about versions 1.0-1.3, it says nothing about the
> PMMU
> on the first BSD version (ie 1.0 or 1.1)! Why is this?

It must be a documentation error. The whole time I've been on this list,
since some time half way between 1.0 and 1.1, you've needed a PMMU. It was
in the FAQ (I thought)...

> All BSD=B4s require a PMMU even if the infopages does not tell this?

Yes. And A/UX requred it too. The protective actions UNIX takes to keep
prograoms from crashing the computer (just themselves) require an MMU.

> Is it totally impossible the get 1.0 to work with a 40 MB HD?=20
> (As I only have a 40 MB HD on my Mac II 8/40).

No, but I'd wonder if it's worth it. If you get rid of MacOS, you can fit
a good chunk of the OS into that drive. But you'd be cramped.

I'd suggest getting another disk drive. In the US, drives are going for ~
1GB/$100US. Even if you can't afford a new one, I bet you can find someone
who wants to upgrade his or her disk, and buy the old one. I have fit most
of the instalation (minus timezones, and the webster dictionary) and X
into a 100 MB drive. I needed more space to _do_ much else, but 100 MB was
a good start.

Also, since SCSI can handle multiple drives, if you can find multiple
retired machines, you can build up a nicely-sized machine. 3 or 4 80 MB
drives will certainly have you on the way to a nicely-featured (though
slow)  machine. :-)=20

Take care,

Bill