[SSJKarma]

actually tremulanX its X-ISM, V-ISM and Z-ISM !
the A-ISM is only on the AMERICAN version as the game was called SF ALPHA so A-ISM was for ALPHA-ISM. if you play the jap version you get the Z-ISM which is ZERO-ISM which incuides the fact tat the game was called SF ZERO in japan !

sorry for the Y-ISM it was my mistake... i meant V-ISM !
in any case... here's the diferences...

X-ISM one bar, one level, takes long to charge but gives the user the most powerfull super of the fighter...

V-ISM, one gauge, cannot use supers, the only thing you can do is do hyper combo's that you do yourself. aka custom combo !

Z-ISM, 3 levels, supers can be used at different levels of power... example, i can charge a super hadoken for only 1 super or i can do it at level 3 for higher damage levels.

we have a mix between Z-ISM and X-ISM actually...
we got 3 levels, but we can't charge up the different supers.
and for my part i like it the way it is.