[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [N8VEM-S100:253] An interesting implementation of MC68000 demand paging...
- To: <n8vem...@googlegroups.com>
- Subject: RE: [N8VEM-S100:253] An interesting implementation of MC68000 demand paging...
- From: "Andrew Lynch" <lyn...@yahoo.com>
- Date: Wed, 8 Jun 2011 19:45:11 -0400
- Authentication-results: gmr-mx.google.com; spf=pass (google.com: best guess record for domain of lyn...@yahoo.com designates 126.96.36.199 as permitted sender) smtp.mail=lyn...@yahoo.com; dkim=pass (test mode) head...@yahoo.com
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1307576718; bh=BEuahM3h5JQD5OF4w6lb+R7FN9on0NtgRiuA9aNdbAs=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:References:Subject:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:Thread-Index:In-Reply-To:X-MimeOLE; b=mjE817ZpLRh55qJWHTUNheLmc5pd4WQccI3nuo6kY+Rwfks6NXf1hPk1DaEAAPWoi58k8eTCZmYtvQD0l41e3BtZMEvHpjtniINUHIT3hhuLW0QlzljI+j5esKwKceR9xuhz1Fy551du6L0RHF/zfIqFr9W234rpzAWKt5jaWcw=
- Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:References:Subject:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:Thread-Index:In-Reply-To:X-MimeOLE; b=UECiJ+OI6BX7E+SUFK2NUSnZD6HptG8hdncQ8HYY0AOLRlAwrC2lzugFUUYA0Rfyw6FKxtXByv9G+yM4CuUk7lndY2LgW9KIA6XVnClOVgLp9agzAg/bCFNuE/6lC81Za75rTsF9zh1IcUq62UhpVWSQh5W3aJdxE5ERKJ5ZWRc= ;
- In-reply-to: <4DE8EB97.firstname.lastname@example.org>
- References: <email@example.com> <4DE8B757.firstname.lastname@example.org> <4DE8EB97.email@example.com>
- Thread-index: Acwh9jFRjWGawThSTGWGtrZVbDxe8gEMAaCA
Hi! The next version of the S-100 68K CPU board is going to come out soon.
My plan is to order some prototype boards in the near future and probably
this upcoming weekend.
There is a lot of activity lately and I have to space out my prototyping and
PCB buying due to cost. However the next S-100 68K CPU board is probably
going to be here in less than three weeks.
So far, I am thinking Pontus and Mike are on the build and test team for
Thanks and have a nice day!
> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
> Behalf Of mike
> Sent: Friday, June 03, 2011 10:12 AM
> To: n8vem...@googlegroups.com
> Subject: [N8VEM-S100:253] An interesting implementation of MC68000 demand
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> Hi All,
> I was just browsing through some of the m68k source in the uClinux
> kernel and started researching the Apollo series after looking at some
> of the support code that looked kind of interesting.
> The early models where based on the MC68000 processor and did, in fact,
> implement demand paging. How they did it was very cleaver. They actually
> ran two 68K processors, one was the main processor and one was a sort of
> MMU assitant such that when the MMU hardware detected that a page would
> fault, it would force the main 68K processor into wait-state while the
> second processor handled the fault and swapped in the page or whatever
> it needed to do.
> I though this was extreemly cleaver, and goes back to something Andrew
> was saying about the 68K MMU that I've been working on that if we could
> keep it sort of generic, it might be able to be used on other processors
> on the S100 bus. Well, using an approach similar to this might make
> demand paging possible with some of the processor that otherwise would
> not be able to support demand paging.
> Anyway just thought I'd share that very interesting tidbit.
> Kind Regards,
> Mike Sharkey
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.10 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
> -----END PGP SIGNATURE-----