[TUHS] 2.9 kernel compile
b4 at gewt.net
Thu Feb 12 02:27:08 AEST 2015
On Wed, 11 Feb 2015, Noel Chiappa wrote:
> > From: Jacob Ritorto
> > I think it's something to do with the fact that he compiled it to run on
> > an 11/23. Maybe it lacks unibus support.
> No, the UNIBUS and QBUS appear (from the programming level) to be identical.
> There are subtle differences (the /23 and its devices can address more than
> 256KB of memory, and some devices have minor differences between the QBUS and
> UBIBUS - e.g. the QBUS DZ has only 4 lines, not 8), but in general, they
> should be interchangeable.
Only the 11/23+ can, early rev 11/23s couldn't go above 256K.
> > Maybe something to do with clock differences.
> Again, if it boots at all, that's not it. (The vanilla /23 doesn't have a
> software-controllable clock, and when booting Unix on one, one has to leave
> the clock switched off till UNIX is running - at least, for the early versions
> of UNIX.)
> > I fired 2.9MSCP up in simh emulating an 11/23 and it works fine. Just to
> > corroborate my hardware experience of it on the '34, I switch the cpu
> > emulation to 11/34 and got a mostly identical crash sequence as with my
> > real hardware.
> Ah. Now we're getting somewhere! If the simulator crashes in the same way, it's
> not flaky hardware (my first guess as to the cause).
> What are the symptoms (in as much detail as you can give us)? What, if anything,
> is printed before it dies?
> > I changed ...
> > UNIBUS_MAP = 0
> > to
> > UNIBUS_MAP = 1
> The /34 doesn't have a UNIBUS map.
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