Thnaks, great game.

Here's what I've found works so far:

Asteroids
Missile Command (no button 3 fire, even when set from UI)
Comes up and starts but no movement:

Battlezone

Freezes at language select:

Qix

Black screen then back to MAMECE Screen (I have over 15megs program space free):

Donkey Kong
Frogger
Galaga
Mario Bros
Star Wars (dang)
Tempest (dang again)
Zaxxon

Could it be a ROM verion issue?

Thanks,

jlc