Just imagine the possibilities: the entire operating system and a small (?) boatload of data could be burned into modern ROM ICs with faster operating speeds than the RAM ICs of the Portable's vintage!

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Ooh, good point! That would be very cool. I wonder though just how difficult it would be to make the machine check for a ROM disk at startup...you'd have to know a fair bit on how to program Mac ROMs....unless you were to somehow reverse engineer the code that the Classic uses to boot off its secret ROM disk, and figure out how to get it to work on a different model?