MAMEWorld Forums - EmuChat - Re: CPS2 emulation questions

> I've just tested using frame-by-frame controlled input in MAME in Vampire Savior,
> SFA2, SFA, and the original Darkstalkers, and reached the surprising conclusion that
> piano reversal inputs don't work in any CPS2 game from Darkstalkers onward (I didn't
> test any Marvel games, but I expect them to be similar, given that X-Men:COTA was
> released after Darkstalkers). In Darkstalkers and later games, when you press a
> button or buttons that complete a command input, it seems the engine always
> "consumes" the buffered joystick inputs whether you're in a state eligible to perform
> that move or not (by constrast, in SF2 the engine only "consumes" the buffered inputs
> if you actually perform the move)
>
> However, I also tested SF3 3s and piano reversals do work in that game. This is not
> surprising, since we already know the SF3 engine has many differences from the CPS2
> games in how inputs are processed--charge partitioning, toward-away-down-up as a
> valid alternate 360 input, etc.

Wow, that's my post from 4 years ago...

I think you're misinterpreting the post. What that post is describing is not something specific to MAME, it's a difference between game engines. "piano reversal" is a technique to execute reversal attacks more easily/reliably by pressing more than one button to do the attack. This technique is possible in Street Fighter 2 (all versions) and in Street Fighter 3, but is not possible in the Street Fighter Alpha games or the Darkstalkers/Vampire games, because of differences in the way the respective game engines process inputs.

Once again, this is not a MAME thing, this is a difference between the actual games. You cannot piano reversal in the SFAlpha or Vampire games on real hardware. It's not related to hardware differences either (SSF2 and SSF2T are on CPS2 hardware and you can piano reversal in them), it's a difference in the game software.

Can you provide a source for the claim that there's a frame rate difference between mame-rr and baseline MAME?