Yes i follow schematic!! Thanks so much for your precious help! Have a good night!YES, YES, YES!!!
I think that will do for tonight. You have done well.
A5/6 and A4/8 was a check for a single logic gate working correctly - but it was also a test for the oscilloscope and the oscilloscope operator !
Have you looked at the PET schematic (#1) to see what A4/8 is? It is an inverter - inverting the output from A5/6!
The channel #1 trace for A4/8 should be the EXACT inverse of the trace for A5/6. Double check that for yourself - and then I will explain tomorrow what we are looking at and why we have gone to all this trouble!
Dave
Good morning Dave, no problemSorry, I was somewhat more busy with work today than I was expecting.
I also had to go out tonight...
We will reconvene tomorrow.
Dave
Hi Dave, ok dont' worry!! Have a relaxing evening!Sorry, I have just spent the last 5 hours searching through documents at work...
I am now "dead beat" to do anything at all!
Dave
I hope you are feeling better.I feel better now I have gone for a long drive to clear my head!
We will start in earnest again tomorrow...
Dave
Lets hope Raspberry PI's, Arduinos and a touch of Python can cope with it.Hugo,
Thanks for the kind words of encouragement.
I do the same thing for a job as well (keeping a large 1980s computer system running in a mission-critical application) so sometimes I just want to sit in front of the TV and vegetate at night time!
I am also trying to train a 'new generation' of young engineers to take over. I want to retire!
Dave
That might be good in terms of fault finding (unless you forgot to turn the computer on).I am desperate!!
The only signal that can i see on Ud9 pin 20 with Ch2 is this
Yes, that will display line power interference.Sorry i I forgot to connect the ground!!