Is it possible with a Supercard SD to run GBC games normally (without using goomba) with a GBA? I can't seem to get it to work, and the game I'm trying to play (Shantae) doesn't run well in Lameboy and runs horribly in goomba.
This probably won't help too much, but try the following:
1. Press L+Start to disable the speed limiter. If it's not already fullspeed, this probably won't do anything.
2. Mess with the GBC Double Speed setting in the options menu (press L+R to access it).