2 Sep
2011
2 Sep
'11
5:45 a.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of Rick Murphy
Sent: 02 September 2011 11:17
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: RE: RQDX3 DEVOFFLINE Problems
At 05:36 AM 9/2/2011, Rob Jarratt wrote:
not
so
Just tried this, I put the RD53 that won't
work into the BA23 and it
worked fine. So I think the M9058 must be faulty. I will see if I can
identify a faulty component on the board.
What the above doesn't say is that you put the RD53 into the BA23 with the
SAME RQDX3 that you are trying to use in the BA123.
If you did do that, I would say your conclusion is valid. If you didn't, much.
OK, but given all the other combinations I have tried I didn't think that
trying the RQDX3 in the BA23 would make any difference, anyway I tried it
all the same. To confirm, I put the RQDX3 and the RD53 from the BA123 where
the disk is seen as offline, into the BA23, essentially testing with a
different distribution panel and a different cable from the RQDX3 to the
panel. In this configuration the disk was seen and the MicroVAX II booted
off it just fine.
Just for good measure I also took the cable from the RQDX3 to the
distribution board from the BA123 and put that in the BA23. So now I have
the RQDX3, the RD53, and the cable from RQDX3 to the distribution board, all
taken from the BA123 and put into the BA23, so now testing just with a
different distribution panel (NB I have already tested the cables from the
distribution panel to the RD53). It still sees the disk and boots off it.
This means it just has to be the distribution panel or the front panel
switches. But I checked the Ready switch and observed at the output of the
distribution board and at the input of the RQDX3 that the switch open and
closed the contact. I think all that is left is the distribution panel
itself.
What I need now is to borrow or buy an M9058 to test with, and ideally a
qbus extender so I can use an oscilloscope to work out which component is
failing.
Regards
Rob