mc68010+mc68451 Unix source?

Michael Holley swtpc6800 at
Sun Oct 30 12:15:45 CDT 2016

Sorry I took so long to respond, I have been out of town.  I designed a plug in board to upgrade the ROM slot to an EPROM but a quick look did not tune up any extras.

I am going to do a serious  downsizing my collection and maybe we can work something out.

Michael Holley
206 484 1181
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at] On Behalf Of Ian S. King
Sent: Tuesday, October 04, 2016 8:28 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: mc68010+mc68451 Unix source?

On Tue, Oct 4, 2016 at 3:14 PM, Al Kossow <aek at> wrote:

> On 10/4/16 3:02 PM, Ken Seefried wrote:
> > Dumb question...did the '451 have a mechanism to work around the
> > instruction restart issue in the 68000?
> no. the 68451 is a segmented mmu, so you wouldn't use it for demand
> paging. the normal way you use it in unix is setting up segents for
> text, data, and bss
I remember reading the spec sheets for a MMU of that type - for the 6809!
That was one versatile little processor.

Ian S. King, MSIS, MSCS, Ph.D. Candidate
The Information School <>
Dissertation: "Why the Conversation Mattered: Constructing a Sociotechnical
Narrative Through a Design Lens

Archivist, Voices From the Rwanda Tribunal <>
Value Sensitive Design Research Lab <>

University of Washington

There is an old Vulcan saying: "Only Nixon could go to China."

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