Thanks for the suggestions, but I have a bunch of ADB keyboards, so unless it's the port on the IIci (possible), I don't think that it is that. And, yes, I've replaced the PROM battery.

In the meantime, I seem to have acquired an Apple TechStep diagnostic unit. If I can hunt down the CPU module for the IIci, I'll try that, and see if it gives me any clues.

The suggestion about a possibly bad solder joint is an interesting one; I'll start trying to check all the joints that I can see.

Thanks!

- Alex