I'd expect nasty crashes when the Finder or an application runs out of RAM."

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Hmmm. While Beesley's comments are founded in logic and likely right, I am inclined to test his "expectations" myself, once I get my hands on both a 128k logic board and some Mac Plus 128k ROMs. Such testing would prove not only IF it crashes due to lack of memory, but also show exactly which conditions cause such crashing. Curiosity killed the cat!

As for formatting an 800K MFS disk on a 64K ROM Mac, it is definitely possible... as soon as I have time to set up my Macs, I will make this a priority to determine since you were unable to reproduce it with your 64K ROM.

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Such will be an outstanding contribution to this thread. I look forward to reading your findings!

Thanks.

BTW, for those reading this post, I got too eager to post 400k/800k information in this thread, which is somewhat off topic. So I would like to now refer to you this thread, where I shall post any further updates.