13 Dec
2012
13 Dec
'12
11:13 p.m.
Jochen Kunz wrote:
(http://osdir.com/ml/os.netbsd.ports.vax/2002-11/msg00073.html)
...so may be it is possible to run *nix or VMS on a rtVAX 300.
I will have both boards next time (KAV30 is laying around here, but I've
not tried to power on this thing jet. There are two 500MB SCSI discs too which
have the software on it that was running on this VME System. No other Parts
On Thu, 13 Dec 2012 15:59:58 +0000
David Brownlee <abs at absd.org> wrote:
I've found a thread in the netbsd lists about this:
While it may have shipped for VAXELN, there
should be enough of a
machine there to run a full blown *nix (or if you ever got hold of the
src to patch) VMS system...
IIRC the rtVAX CPUs have a slightly different (only
one level?) TLB /
page table layout and thus are not able to run *nix. At least not
without adapting the VM subsystem. See the KA620 CPU board.
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/} The 2nd Ed.
VARM discusses the rtVAX, but doesn't mention specific
models, but I'd gather this would be characteristic of all of them:
[p. 422]
11.2.3 rtVAX Memory Management
The rtVAX is a variant of the VAX Architecture. An rtVAX processor
implements the per-process page tables in physical memory. All other
VAX processors implement the per-process page tables in virtual
memory. Therefore, translation of process-space addresses is
different on an rtVAX than as described in Chapter 4.
This is certainly true of the original rtVAX chip, the KA620. This was
basically a hacked KA630. The idea was to produce a chip that was mostly
a VAX but could not run VMS and hence could be sold cheap without
risking undercutting VMS sales (or so I heard). AFAIK, the later
rtVAX systems were based on standard chips - I never heard of a
cut down CVAX, for example (this doesn't mean it didn't happen though ...)
from this system are here (have a VME Craddle and
several unusual 68000
CPUs in a external storage).
The other thing is this ISA Board on the picture, this can't be a KAV30 but
it seems to be very similar. Hope I get my hands on it today...
Regards,
Holm
PS: (Jochen your discs aren't forgotten, hope I have time for them between
christmas and new year..)
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