3 Mar
2008
3 Mar
'08
12:30 p.m.
Which is the
main reason I'm not 100% convinced the FPU is faulty. But I
can't get the extended disgnostics to test it, and I don't know how
"good"
it has to be to pass the basic startup test.
It doesnt other than not jamming the busses. VAX does not need the FPU
to boot. If anyone has a
running VS2000 or UV2000 and is willing to open it up to
help me do some comparison testing, here are the things I would most like
to know:
I had mine open for temperature testing, thats were I got the 58C
from. I should play with console boot later.
[For best results, it would be good if the system
were configured to match
mine - all expansion boards, drives, peripherals etc. disconnected, and
the uVAX/VS jumper located about 3" directly behind the BNC ethernet connector
set to the uVAX position, which is AWAY from the BNC connector.]
Sounds like mine more or less. I cant scope it at this time as the wide
band scope is burried and likely not going to emerge for a while. I
have a 20mhz dual trace for most work handy as it's smaller but it
will not see a 40mhz clock well nor do I use it for that kind of work. Me I'd pull a old MVII cpu card and do the remove
and replace of the FPU
and CPU. MicroVAXIIs with good cpus and FPU and bad Qbus interfaces are
not uncommon.
I have an uVAXII - and while the 2000 would probably be a more "handy"
machine, I'm not ready to sacrifice the uVAXII yet as I'd like to try my
hand at getting a Qbus VAX going...
If anyone does happen to have a spare VS2000/uVAX2000/uVAXII CPU board,
I'd be interested ... even dead/defective ones may be useful, as the
CPU & FPU may still be good.
Dave
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html