[rescue] 3b2 Emulator

Bill Stivers stiversb at gmail.com
Thu Jan 22 17:48:19 CST 2015

Seth is a pretty brilliant guy.  If you can render him any assistance, it
wouldnbt go wasted.


> On 2015-jan-22, at 13:21, Jerry Kemp <sun.mail.list47 at oryx.us> wrote:
> FYI.
> This isn't mine, and I don't have any insights into this aside from the
> This is a repost of an email from the Classic CMP mailing list dated 19
January 2015.
> I thought that it might be of value as we have a 3b2 discussion ongoing at
that time.
> Jerry
> P.S. Mr. Bill, hope your job search is going well!
> =================================================================
> Hi everyone,
> I've made tremendous progress on my 3B2 emulator. It's being
> implemented under the SIMH simulator platform, which has been a huge
> help.
> My WE32100 core is getting closer to being complete. I'd consider it
> alpha quality right now, but it has enough instruction coverage to
> pass the 3B2's power-on self tests and to (barely) run some of the 3B2
> firmware mode tools.
> Implementing the WE32100 core has been thanks to the processor manual
> and assembly language manuals that are available on BitSavers, but
> outside of the CPU, virtually all of my understanding of the 3B2's
> architecture has come from studying the ROMs and the SYSVR3 source
> code. I've also been helped by having remote access to a running 3B2
> so I can assemble and disassemble code using the real AT&T tools.
> Beyond that, I have found precious little documentation.
> I'm at the point now where I'm pretty well stuck until I can find more
> information. I understand large chunks of the memory map now and
> should be able to do things like simulate the floppy and hard disk
> controller, but there are large gaps in my understanding. There are
> many undocumented registers that are used by the firmware, but don't
> appear in the SYSV source code anywhere. What they mean and what
> they're for is anybody's guess. I've just stubbed them out for now.
> If anybody has access to schematics, architecture docs, or other
> memory map information, I'd be eternally grateful if you could share
> it!
> -Seth
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

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