Sorry I can't describe this better but midi ends up being played
too fast/slow here and some notes have the wrong duration when
using eap(4) an mt-32 and scummvm. The timing of when the notes
start seems to be off as well.
http://jsg.id.au/misc/with_patch.ogg
http://jsg.id.au/misc/without_patch.o
Certain midi uarts don't have interrupts, so when data is sent, the
driver spins (at IPL_AUDIO) until the uart becomes ready. This is not
a big problem because uarts have ~16-32 byte fifos, and programs don't
send large chunks of data, so uarts always appear ready. Except for
large messages, which
