12 Apr
2015
12 Apr
'15
4 a.m.
On 04/11/2015 09:47 PM, Johnny Billquist wrote:
Yes, it is. And T-bit is when the T-bit in the PSW is set. That is how
debuggers single step code. So T-bit and BPT are very much just two
sides of the same coin.
Oh yes, that is ringing a bell now. I see how it makes no sense for
that to be happening here.
It's just that T-bit trap or BPT is not something
you'd normally get
here.
I thought that was the case, but I wasn't sure. BPT is breakpoint
trap, isn't it?? Ok. Memory shortage is the one thing I can imagine
could cause something
like this. If a program runs out of memory, the programmer could just
have thrown a BPT in there as a way of crashing out.
Otherwise I'm not coming up with any good ideas here...
:-(
Ok. Well I suppose my demo of an 11/34 could be trying to get through
a sysgen. That certainly wasn't unusual in datacenters in the 1970s and
1980s! ;)
I just don't want Yet Another PDP-11 Running RT-11. RT-11 is great
for testing out a new machine, but it just doesn't DO very much, and
it's what everyone assumes every PDP-11 is running.
My current sysgen attempt has reached the RSXASM stage. I am walking
very gently around the racks..
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA