So, I could not resist, and I picked up this non-functional PC-6220.
And yes it was certainly non functional. The Nicd battery pack was just a mess and done for.
Some nice surprises:
* it came with an external FDD, so that helps to transfer files
* it was fully intact, just not working
Or course, I tore into it to find the issue. And.. I did.
The PSU needed to be recapped. It was a real learning experience. Under my microscope, all of the surface mount electrolytic caps had beads of fluid on their pins, and some of the pins were quite corroded.
Anyhow, I found enough parts in my various bins to get the nasty caps swapped, et voila! A perfectly fine PC-6220.
Best of all, I found the service manual for 6$ online. and I have what I need to make an XT-CF adaptation.
Other nice surprises:
* what a nice piece of compact engineering! very impressive
* the old Connor 20MB disk is working fine. Quite loud though. I wonder if that means imminent death.
* the LCD is really super nice and readable - which is why I ultimately wanted it as an improvement over my Zenith Z-171.
So, stage 1 success.
stage2 = add 80C287 and a homemade nimh batt pack
stage3 = design a clever XT-CF adaptation (and get away from that loud spinning disk