PDP-11/44 problem - RUN stays on
henk.gooijen at oce.com
Wed Nov 8 14:33:04 CST 2006
>> "?CP didn't start". I already knew that this is the
>> typical bus hang condition,
>Yup it is, seems you fixed it with the G7273
>> However, ... besides the DC ON light, the RUN light
>> stays ON too. I am sure the RUN light should go OFF.
>Disclaimer... I'm new to these machines, the below is a newbies guesses :)
>Perhaps your M7098 (UBI) module is set to autoboot from one of the proms
>upon powerup, and that's why it comes up in run mode. This is a personal
>preference thing, but I never have a machine autoboot to anything other
>than >the console emulator. I then always select the boot device by hand.
>Many people instead set the switches on the UBI to attempt a boot from a
>particular device upon powerup. This may be why you power on in run mode.
>I would suggest that you look at the 10 position dip switch on the UBI and
>set 1,2, and 7 on and all the rest off. Then power up and see if you dont
>get just the console prompt.
I read about that DIP switch on the UBI this afternoon! But the system
was working and started to the Console prompt just a half hour before.
I will flip the switches anyway, because I learned from Don that when
they are "ON" it does not always mean that their resistance is real low!
As I read through the 11/44 manual, I am updating my webpage too :)
>> and nothing more, no ">>>" prompt anymore!
>> Also, the FAULT lamp on the RL02 drive stays ON.
>If I was to make a newbie guess... you have a problem with your RL02
>subsystem (drive, cable, or controller) and your UBI is perhaps set
>to boot the DL prom. So when you power it on it attempts to boot the
>RL02 and hangs because of another problem. Setting the switches as
>above would identify this possibility. If it then comes up to the
>CONSOLE prompt correctly, you can at least know it's time to zero in
>on the RL02 subsystem.
Well, my first thought was: "It was OK half an hour ago"... but then I
remembered something. Maybe not such a dumb newbie, Jay! The last weeks
I have been helping people that were looking for something. This morning
I shipped an RL terminator, that I removed from the RL02 drive yesterday!
I did that, because then I was certain it was a good one ... I plugged
an other terminator on the RL02 drive; yes I did not forget that.
But ... it could be a bad terminator. It's just resistors, but still...!
I can't check that this evening. Have to get up to the attic, but everybody
already went to bed. The RUN lamp lit on the 11/44 and the FAULT lamp on
the RL02 may have no relation at all! Thanks, I wouldn't have thought of it!
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