It’s because MAME is a multi purpose emulator.
Mame emulates multiple machines, multiple hardware configurations from the 70s and up while Callus is geared towards Capcom machines.
Mame is useful if you have multiple hardware configs to emulate, but it doesn’t do that well on any one particular hardware.
Like I used a dedicated emu for Neo Geo games till it got myself a actual MVS board.
Did you use NeoRAGEx?
Yep
Make the hurting stop 
Keyboards are not subject to 125 hz polling on Windows like mice are, and neither are game controllers.
As already discussed, key limits are not because of polling but rollover. Gaming keyboard usually have higher rollover than normal keyboards, and other things like sturdier designs plus mechanical switches. Has nothing to do with polling.
OK, I got that. But do you know if a keyboard with higher rollover would make diagonal-abusive DMs like Raging Storm, Somersault Justice and Rolling Izuna Drop easier to do?
You less likely to hit your limit on how many keys you can hit at a single moment.
Watch out for some of the cheaper keyboards without a key rollover limit, as they are subject to ghosting (false or erroneous inputs).
I know, worst is I know some of the Geek Hack regulars who build their own keyboards from scratch would nit-pick and correct even my posts for getting the details wrong or missing finer details.
If you are a seriously a keyboard player who wants a good keyboard do your research, go to forums such as Geek Hack, that their thing. https://geekhack.org/
Its funny as on Geek Hack they don’t value high key roll over for most PC games, then again most PC gamers play FPS, MMOs, RTS, MOBAs and such
Games like Street Fighter are the only few where N Key rollover is desirable.
When its all said and done you want something that just happens to be reliable.
@calil_bfr Forget polling all together.
Get a PS/2 keyboard (yes there are plenty of good keyboards that are still made that are PS/2 including “gaming” keyboards. PS/2 keyboards don’t even use polling, they operate on the Interrupt system.
The Interrupt method of how a PS/2 should work to where it even satisfied the most picky of those who are worried about latency. As Interrupt “does not care”, its Interrupts (excuse the pun).
You want ether 6 key roll over or N Key rollover for Street Fighter, there no such thing as a 5 key roll over and for fighters a 4 key roll over isn’t enough.
You don’t have to get a mechanical keyboard, there some rubber dome or carbon contact keyboards that work just as good if you are on a budget.
Make sure the keyboard you select does not have issues with ghosting.
Hell, if you don’t mind the work with cleaning and such, get a old keyboard from the 80s maybe early 90s.
Like a old Workstation or Points of Sale Keyboard.
Some of the more popular keyboards is the old IBM model M keyboard, many (but not all) are AT keyboards so you need a AT to PS/2 adapter. Those which are not AT keyboards are some other old format.
They are mechanical, and they perform almost to just as well as they used to back in the day.
That’s just what it’s called if you go looking for videos or guides on how to do it.
Isn’t that how USB fundamentally work, by polling for signals? I need to find a way to test this.
Joy2Key plus a mouse polling app. You can map anything to mouse movements and test.
https://www.youtube.com/watch?v=fq2KKoCt2Hs
In the Zangief part (4:17 - 5:56), this guy seems to do the 360 and 720 motions - normally a pain to pull off on keyboards - with ease using his Razer don’t-know-the-model.
I’ll write him to ask if he can do these and the diagonal-abusive motions easily in Ultra SF4 and in emulators.
@Falkentyne, you who have two Ducky Shine models, can you do these tests too?
I don’t play fighting games with keyboards, sorry. And I can’t do 360s’ on keyboards. All I can tell you is that PPP and KKK register on the ducky shine.
I checked with more than a dozen sources, polling only matters on a mouse because how it effects movement.
Example USB polling is nonexistent in devices such as a USB thumb drive or Hard Drive connected via USB.
Polling is always a set rate unless you use some program to change that or you hack your OS.
Can we get off this topic, there nothing to be gained about worrying about USB polling.
Razer keyboards are terrible, I wouldn’t waste your money.
The game the guy was demonstrating in is Street Fighter 5, but the core game mechanics haven’t changed since Street Fighter 2.
It was just to illustrate the fact he’s using a gaming keyboard, but thanks for the advice. 
I know the game mechanics haven’t changed, but the execution is influenced by the game speed in games where you can change it.
In CvS2 and SFA3, for example, speeds higher than 1 star and Normal, respectively, make me even less likely to do the diagonal-abusive DMs.
I’d like to know if a gaming keyboard could overcome this issue.
From my understanding, a gaming keyboard wouldn’t change anything in terms of ease of execution.
Like everyone’s said, the main thing to note with gaming keyboards is the n-key-rollover. That said, the only advantage it’d give you over a regular keyboard is the ability to have more keys pressed at the same time; it should not have any impact on the ease (or difficulty) of pressing things sequentially.
If it reads diagonals better than a common keyboard, chances are I’ll be pretty satisfied, since my issues are with diagonal-abusive DMs.
I’m pretty sure it won’t help strictly with diagonals. A diagonal is 2 inputs, and most standard keyboards are good for 3-4 keys pressed simultaneously anyways.
Where it might help is if you needed to press your directionals (including diagonals) in such quick succession that you might overlap some (ie, if you were doing a 2xHCF, and there might be some time in that motion where you have L, D, R all pressed at the same time) AND you were pressing PPP. A regular keyboard might crap out because you may be pressing 6+ keys at the same time, whereas a gaming keyboard that has 6-or-more key-rollover wouldn’t.
Can we lock this thread already? Several people have already wasted more than enough of their time here.
No one here is being aggressive, so I see no reason why the gunpowder treason should ever be forgot this thread should be locked.
I already understood that polling does not matter in this case, but the doubts aren’t over yet.
K.
This shortcut worked very well here. Only in USF4, unfortunately, but it was a great help for when I want to play this SF as Guile or Vega.
And it was a Brazilian helping another! =)
As noobish as this may be, by the time I opened this thread I hadn’t yet discovered a thing called command buffer.
At least I finally found out what makes diagonal-abusive moves and circle motion moves harder to pull off in some games - or, depending on the game, speeds.
Such a shame, since it seems that the older the game, the harder these moves are to execute. Raging Storm, for example, has a considerably better buffer in KOF 98 Ultimate Match and KOF 2002 Unlimited Match than it has in KOF 96 and the Fatal Fury series.
I also presume that Capcom gave Rolling Izuna Drop a better buffer than Double Somersault’s in SSF2T, since, at least according to my tests, it’s way easier to pull off - at any speed - than Double Somersault.
Anyway, I’ve reached the conclusion that a gaming keyboard (mechanical or hybrid) would only be a good buy for fighting games if for better key durability and better feel when pressing the keys. How sad.