OS X MIDI with Classic is possible.
This article is a follow-up to my article OS X Music and Audio: When will it be Ready to Rock?. Coda Technology, makers of the music notation programFinale, has responded to clarify MIDI compatibilityissues.
An Archive source writes:
Someone I know just spotted three (count ‘em) prototype enclosures (no innards) for SOP. They had the chance to hold them in their hands. Seems like a blown up iBook that can now accept a 14-inch LCD and some new ports. It seems to accept the iBook 2 motherboard with no modifications.