Still seeking 3B2 information
lists at loomcom.com
Fri Aug 14 14:28:27 CDT 2015
* On Tue, Aug 11, 2015 at 09:36:36AM -0500, Jerry Kemp <other at oryx.us> wrote:
> Hello Seth,
> We were having a 3B2 discussion on the Sun Rescue list, and that got
> me to thinking about your emulator project.
> Can you share a status update?
Sadly, it's been stalled for quite some time now. Current status is
pretty much the same as it was in January. The simulator can boot the
3B2/400 firmware, pass diagnostics, and read directories from virtual
floppy disks. Unfortunately, it can't get much beyond that -- trying
to boot the UNIX kernel still fails miserably.
I'd hoped to have much better progress to share, but Real Life
intervened by throwing me several major curve-balls in the first half
of this year, and it's only now that things are really starting to
Even so, two things are still really holding me up:
1. Lack of good documentation for the system design of the 3B2
2. Lack of access to a physical 3B2
I hope to get #2 sorted out soon(-ish), so I can run a 3B2 with a
logic analyzer attached. There's still some mystery surrounding some
system timers and interrupts that I need to figure out before I can
really make progress.
I'd still love to get #1 sorted out, too. There are some 3B2 internals
docs on their way to Al Kossow that I hope will get scanned in the
next few months, I think that would help greatly.
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