I was lurker in GBATemp for many years before joined here and I was 14 years old when GBATemp launched, and I played GBA a lot, along with PS2 and GameCube.
I played all regions with either patching the games directly or a boot disk wasn't too hard even shrank some games to fit on normal CDRs lol that was a bit harder
Honestly kind of shocked I cannot run Killer Instinct Gold.... I don't think it's a hardware issue I think the emulator is well all 4 I tried wouldn't go