And your question about possibly being able to use a 180's ram module in the 100 is an interesting one. Even if the module were electrically compatible (a fact yet to be determined), though, I worry that it wouldn't fit in the tiny space allotted in the 100. I have a broken 180 that I've been meaning to crack open "one of these days," and your question might just be what motivates me to pop it open sooner than later.

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Tom, the Apple developer notes seem to indicate that a good RAM card design should work in all of the 1xx series PBs (except possibly the 190 which was based on the 5xx series). It says the 100/140/170 is electrically compatible with the 160/180 which use 85ns RAM. The older RAM will work but imposes a wait state. The newer RAM will work in the older but limits the available RAM. So I should be able to stick a 6MB module in the PowerBook 100 assuming it would fit AND THE MANUFACTURER FOLLOWED ALL OF APPLE'S GUIDELINES.