New topic as I continue to troubleshoot my old Apple //c and try to bring it back to life.
Now that it boots (yay!, thanks for the help from this forum), the display has a slow "wave" left-to-right that moves up from the bottom to top. It is not the monitor. I switched out the little //c monitor for a Apple Color Composite monitor. Same symptom.
It repeats about every 15 seconds or so... starting from the bottom, slowly progressing up to the top, in curved grouping about the 1" in size like someone is taking a hold of the edge and pulling it left very smoothly. Again, NOT the monitor as I've tested on two different monitors with same result.
Thanks for any ideas.