ell iv ision ▁II ▁was ▁promoted ▁to ▁be ▁compatible ▁with ▁the ▁original . ▁ ▁It ▁was ▁discovered ▁that ▁a ▁few ▁Cole co ▁Int ell iv ision ▁games ▁did ▁not ▁work ▁on ▁the ▁Int ell iv ision ▁II . ▁ ▁Matt el ▁secret ly ▁changed ▁the ▁Int ell iv ision ' s ▁internal ▁R OM ▁program ▁( Exec ) ▁in ▁an ▁attempt ▁to ▁lock ▁out ▁ 3 rd ▁party ▁titles . ▁ ▁A ▁few ▁of ▁Cole co ' s ▁early ▁games ▁were ▁affected ▁but ▁the ▁ 3 rd ▁party ▁developers ▁quickly ▁figured ▁out ▁how ▁to ▁get ▁around ▁it . ▁ ▁Matt el ' s ▁own ▁Electric ▁Company ▁Word ▁Fun , ▁however , ▁will ▁not ▁run ▁on ▁the ▁Int ell iv ision ▁II ▁due ▁to ▁this ▁change . ▁ ▁In ▁an ▁un related ▁issue ▁but ▁also ▁due ▁to ▁Exec ▁changes , ▁Super ▁Pro ▁Football ▁experiences ▁a ▁minor ▁gl itch ▁where ▁the ▁quarter back ▁does ▁not ▁appear ▁until ▁after ▁the ▁ball ▁is ▁h ik ed . ▁There ▁were ▁also ▁some ▁minor ▁changes ▁to ▁the ▁sound ▁chip ▁( A Y - 3 - 8 9 1 4 A / A Y - 3 - 8 9 1 6 ) ▁affect ing ▁sound ▁effects ▁in ▁some ▁games . ▁ ▁Program mers ▁at ▁Matt el ▁discovered ▁the ▁audio ▁differences ▁and ▁avoided ▁the ▁problem ▁in ▁future ▁games . ▁ ▁Int ell iv ision ▁IV ▁Dave ▁Ch and ler ' s ▁group ▁began ▁design ing ▁Matt el ' s ▁next ▁generation ▁console ▁in ▁ 1 9 8 1 ▁c oden amed