Looking for someone to advise/assist in troubleshooting and repair of a PET 2001-8. Device boots but screen display is garbled (but READY prompt is somewhat legible). Key presses are recognized but display produces a distorted character.
Now you mention it... I'm not sure... I cannot see the chip numbers in the first image... too blurred.Isn't this a dynamic PET with soldered RAM chips? If so swapping chips around isn't that easy unfortunately.
I think the two video RAMs are 2114 static RAMs (18 pin devices) and the main ram is 4116 dynamic RAM(16 pin devices) so the IC's are not interchangeable.Another thing to try would be to swap the 2 video RAMs for 2 system RAMs... I would suggest swapping... C3 & C4.... with I8 and J8
Let us know what you see!
I think the two video RAMs are 2114 static RAMs (18 pin devices) and the main ram is 4116 dynamic RAM(16 pin devices) so the IC's are not interchangeable.
That is very interesting.That seems to be the perceived wisdom Hugo but I'm only going by comments gleaned from the web such as this article:
Seems plausible.
Alan