PDP-11/44 problem - RUN stays on

[Gooijen, Henk]

Don wrote:
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Don North
> Sent: woensdag 8 november 2006 23:46
> To: On-Topic and Off-Topic Posts
> Subject: Re: PDP-11/44 problem - RUN stays on
> 
> Jay West wrote:
> > Henk wrote...
> >> I tried the suggestion from Don with the M9302 in the last slot
> >> of the 11/44 backplane. To my surprise, when you hit ^P, the 
> >> system prints a new "(Program)" line and the cursor (_) moves
> >> to the next line.
> >> So, now I am thinking ... a wrong/dead terminator on the 
> >> RL02 drive, can it have such an effect that through the RL11 
> >> controller the bus hangs?!
> > IF you changed the dipswitches on the UBI board as I mentioned
> > in my > > previous email, AND you get the same response as above
> > (^P gives another (program) display)... then I bet your front
> > panel board (slot 1AB) or your MFM board is toasty.
> 
> ^P should toggle the console mode between talking to the 
> 11/44 serial port (program) and the front panel microcontroller
> (>>> prompt). 
> If ^P never comes back with a >>> prompt then as Jay said 
> something is funky with your MFM module. IIRC if you put the 
> front panel switch to the locked position if forces 'program' 
> mode and ^P is ignored, all characters go to the 11/44.

Yes, that is in the manual. I have the front panel switch on "LOCAL".
Am I correct that the messages "(Console V3.40C)", "(Program)", come
from a different source than the ">>>" prompt?
If the first 2 mesages also come from the MFM module, then why can't
the prompt come from there?  If all 3 messages come from the MFM,
I would say that the MFM is not toast ... Can some hardware problem
hold the ">>>", but let the initial two messages get out?

- Henk.


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