mocking board

[ctkwan@ns.csd.hku.hk (Doug Kwan ~{9XUq5B~})]

I am writing an Apple ][ emulator on Unix. (Yes, this is yet another
Apple ][ emulator.) My emulator emulates the Apple ][ speaker but I
want to add mocking board support. I would like to get technical info
about the mocking board like the control registers, interrupt and ...
which are interesting from an assembly programmer's point of view.
Any info will be appreciated. I've just got the disk image of Ultima V
and I really want to play it on the Silicon Graphics workstations in
our labs with the cool background music.

-Doug