No lights after update

[Curtis Smith (史國興)]

Hello!

Inspired by the latest newsletter, I decided to update my PiDP-10, answering Yes to all questions.  (Why not have the source, as well?)   All went well, but when I now reboot my RPi-4 PiDP-10, I get no blinkenlights.  Logging in via ssh, I receive the following before the prompt line appears:

  Starting pdpcontrol...
  Starting PiDP-10 with boot option 0000
  screen -dmS pidp10 ./pidp10 /opt/pidp10/systems/hills-blinky/boot.pidp
  0

 

I did not get this before the update, either.  Can anyone give me a clue as to what went wrong?

Thank you!

[Curtis Dean Smith]

Correction: RPi-5

 

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[oscarv]

Curtis,

>> Inspired by the latest newsletter, I decided to update my PiDP-10, answering Yes to all questions.  

>> (Why not have the source, as well?)   All went well, but when I now reboot my RPi-4 PiDP-10, 

>> I get no blinkenlights.  Logging in via ssh, I receive the following before the prompt line appears:

That is worrying. It's too late at night here to test it out now, but I will look into it tomorrow.

If you have the time and the inclination, would you mind trying:

pdpcontrol stop

then,

pdpcontrol start

...do things work then?

But I will check tomorrow!

Kind regards,

Oscar.

[Curtis Dean Smith]

Oscar, 

I tried that, and even more: I moved the /opt/pido10 directory and did a complete install, but with no joy. I them moved my year-old directory back and have blinkenlights back again. 

Curtis 

 

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[Curtis Smith (史國興)]

I have tried a few installs short of a complete system re-install.  Am I the only one with this problem?  If so, I will go ahead and wipe my system and start afresh, although I hope not to need to go that far.

[terri-...@glaver.org]

On Wednesday, April 29, 2026 at 6:05:31 PM UTC-4 smi...@gmail.com wrote:

  Starting pdpcontrol...
  Starting PiDP-10 with boot option 0000
  screen -dmS pidp10 ./pidp10 /opt/pidp10/systems/hills-blinky/boot.pidp
  0

 

I did not get this before the update, either.  Can anyone give me a clue as to what went wrong?

The "0" indicates that screen didn't find any attachable sessions. Not very useful

if you don't hnow what the zero means. I changed the PiDP-11 version to be a bit

more informative:
procs=`screen -ls pidp11 | egrep '[0-9]+\.pidp11' | wc -l` if [ $procs -eq 0 ]; then echo No PDP-11 emulator detected as running - check with pdp11control. exit 1 fi if [ $procs -gt 1 ]; then echo More than one screen session found; results may be unpredictable. fi if [ $procs -ne 0 ]; then screen -d -r fiHowever, it is likely that some underlying issue caused the emulator to fail

to start, which is why there is nothing to attach to.

[terri-...@glaver.org]

Well, that certainly didn't show up the way the preview looked. Here's a link to the code:
https://github.com/Terri-Kennedy/pidp11/blob/main/etc/pdp.sh

[Curtis Smith (史國興)]

So, it turned out to be a mismatch of libc; the packaged pidp10 was linked to 2.38 but my bookworm has only libc-2.36.  A recompile fixed that.  Maybe I should update my pi, though.