Yes, this is basically my understanding as well.

onlyonemac said:

Also I don't see why, if uClinux can run the Macintosh Plus hardware, why we can't just boot it from a floppy or hard drive like we do with *NIX on our other 68k Macs.

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I think you could do that, if there were already a version of uClinux for the Plus. Putting it in ROM would just make it more direct -- it's basically an excuse for something interesting to do with the Plus ROM adapter board.