Zitat von Paul Koning <paulkon...@comcast.net>:
On Apr 27, 2016, at 9:07 AM, e...@e-bbes.com wrote:
If "accurate" means to run VMS or Unix, it shouldn't be to difficult.
You might be surprised.
Probably not. I have both working here as Software emulations ;-)
Getting a PDP-11 FPGA to be accurate enough to run standard
operating systems is hard enough (as I found out helping Sytze's
"pdp2011" project). And that's a much simpler CPU than VAX. In
particular, the privileged architecture tends to be critical for
getting an OS to boot, and that part tends to be poorly documented
(as well as variable from one CPU model to the next).
Funny as it Sound, the VAX was easier, but all the Floating Point
formats took a while to implement ...
I don't know. Fun is certainly a good reason for many of us.
Yup, that's how it started ;-)
I don't know if there are any unexpired patents; if not, then
implementing a machine from the published documentation seems fine,
though running the software might require answering some licensing
questions.
That's the real pain in the neck, to Transfer licenses from one
machine to the next ...
Cheers
