Finally! I didn’t have a good way to explain all of this.

A scaler will lag. Doing pure 15kHz RGB/Sync->Composite/Svideo won’t.

edit: I will say this though, i’ve encountered some weird superguns. I think it was the Arcade in a Box JAMMA in a box supergun that as on display at Classic gaming expo that had this really weird lagging thing. Might have just been me.

Sorry for the old bump… was wondering if most emulators fixed the input delay/lags?

Is Nebula still the emulator to use for 0 input lag?

How about kawaks, fba, mame?

Can’t speak for any street fighter games, but all the tests I’ve done for KOF games in different emulators have seemed to turn up at least a frame of lag. Example: In the service menu of King of Fighters 2002 (F2 for FBA) you can get to a screen to test out if your buttons are working correctly. When I pause the game, and press and hold a button, it takes 3 frame advances (F1 in FBA after pausing the game) to register on the screen. It would seem to me that if everything was working correctly, it would only take two frame advancements, one frame advancement for the game to recognize the input, and the next frame to display it.

This probably isn’t the best test, but I don’t have 60 FPS camera to test things out more thoroughly. I wish I did. One other thing, turning off the sound does nothing for input lag on KOF games, it just causes the frame advancement feature of the emulator to skip 2 frames instead of one for some unknown reason.

Thanks… anybody else with more recent testings?

A little followup on my previous post that I meant to write earlier:

It seems that the emulator is actually not lagging a frame. Example: I pause the game (kof 2002 with a debug dipswitch enabled, note that this is the not the emulator debugging mode), and input a+b (roll), then advance one frame, the debug numbers on the screen change, I advance one more frame, the roll initiates. It looks like like the game is recognizing the input immediately after advancing one frame, which seems like how it should be working.

Apparently the service menu has a an in-game 1 frame lag on it. Note that kawaks does seem to have a 1 frame delay with this testing method, however accurate it actually is.

One interesting note about kof 2002, and I sure a lot of fighting games are have something similar this, but a 2 frame ground attack, like kim’s close c doesn’t actually come out in two frames after you input it. It takes 4 frames advances, then it goes into 2 more, then hits. That 4 frame lag seems to be consistent on all ground and air attacks, and acts just like a real four frame lag would for timing purposes, i.e. you can hit kim’s close C a little early when recovering from an attack, so it comes out in 2 frames (then hits) immediately after recovering from the attack/block/whatever else. The difference is that 4 frame delay doesn’t apply to everything, a roll is instant, the game recognizes the input, and it comes out. There plenty of other differences as well, in terms of moving and jumping etc. I think specials come out the first frame as I recall as well.