He encontrado en gamefaqs esto ^_^
Use classic character's in Classic Arcade Mode
If you entered the code correctly, you will hear a sound. The classic versions do not have super combos and cannot reduce throw damage.
Code Effect
Jab, Right, Left(2), Right, Jab Classic Balrog
Jab, Left, Right(3), Jab Classic Blanka
Jab, Up(2), Down(2), Jab` Classic Cammy
Jab, Down(3), Up, Jab Classic Chun-Li
Jab, Down(2), Up(2), Jab Classic Dee Jay
Jab, Down, Up(3), Jab Classic Dhalsim
Jab, Up(3), Down, Jab Classic E. Honda
Jab, Left(2), Right(2), Jab Classic Fei Long
Jab, Up, Down(3), Jab Classic Guile
Jab, Left(3), Right, Jab Classic Ken
Jab, Down, Up(2), Down, Jab Classic M. Bison
Jab, Right(3), Left, Jab Classic Ryu
Jab, Up, Down(3), Up, Jab Classic Sagat
Jab, Right(2), Left(2), Jab Classic T. Hawk
Jab, Left, Right(2), Left, Jab Classic Vega
Jab, Left, Right(3), Jab Classic Zangief
Contributed By: Joutai.
Curiosamente NO SE LO QUE ES JAB y no lo entiendo en el modo classico te deja elegir si personaje SSF2T o SSF2 normal ..... ¿Que clasicos son?
¿Alguien sabe algo?