Genesis Frog Feast

I've implemented the sound effects into the Genesis version of Frog Feast. I'm wrapping Paul Lee's sound driver into my routines. It's working nicely.

I also corrected a problem with a joystick using the 'B' buton instead of the 'A' button. If I put the joystick read in it's own routine, it doesn't work correctly. It's probably a bus or timing issue.