OZNEAAVS        Infinite lives
GXUEALVI        Infinite bombs
GZNEIOVS        Infinite credits
GZXATEOZ        Start with 1 life--player 1
AAUALAGA        Start with 1 life--player 2
AAUALAGE        Start with 9 lives--player 2
AAEELOGI        Autofire
TAVPSTLA        Double bombs
TAUAYALA        Double credits     
AANEZPGA        1 life after continue--both players
AANEZPGE        9 lives after continue--both players
TAXEZAXZ + PZXELENY     Start with 9 lives--player 1
EZXAPPKZ + TAXAZOIL     Start with maximum firepower