In the span of a month I bought a very complete and very good Leading Edge XT clone, a bare XT motherboard that turned out to be functional, and now what was a dead IBM XT and is now functional as well
The IBM gave the most trouble, but unlike some of the noname clone stuff of the era, IBM's technical manuals effectively describe how to build their computer, from detailed system board schematics, to the full BIOS assembly sources. If that's not enough, http://www.minuszerodegrees.net/ has every troubleshooting detail documented already. I cut off two tantalum caps on the 12V power rails and that fixed the short to ground and brought this thing back from the dead
@derek leading edge! i haven't heard that name in a long, long time...
@derek I'm pretty sure Leading Edge was a sponsor for The Computer Chronicles, which gives them points in my book. I seem to remember the clones featured on their title card as being relatively attractive machines a well.