Rockman X2 title screen has lag frames

[AkiteruSDA]

Tested using core from 25.06.05. The title screen for Rockman X2 on MiSTer has lag frames when X shoots his buster shot, but doesn't on a real SNES and original cartridge. Here's a video comparison: https://www.youtube.com/watch?v=KgS3mVSKoK4

I know this is minor, but since there isn't much happening on the title screen, the presence of lag might point to some Cx4-related inaccuracy.

[TheJesusFish]

Please check the latest unstable if you haven't already. https://github.com/MiSTer-unstable-nightlies/SNES_MiSTer/releases/download/unstable-builds/SNES_unstable_20250920_09815f.rbf

[AkiteruSDA]

Yes, the issue still appears to be present in 20250928.

[TheJesusFish]

So I'm having trouble seeing it. I took a 120fps video and slowed it down. If anything, maybe there is a stutter when the shot is between Game and Start. I don't have real hardware to take a similar video with.

This is with the 20251009 unstable.

trim.2083CE8C-CD7F-4C1D-873D-EF42A643FE6A.MOV

[AkiteruSDA]

It might be easier to see if you compare it to the X3 title screen, but yes, it is currently pretty subtle on MiSTer. If you compare X2 and X3 on Wii U Virtual Console, the X2 title screen there has a lot of lag there. I'll try to see if the issue previously existed in a software emulator and was resolved, I suspect the issue would probably be related.

[littlegamer87]

You can frame advance a youtube video when paused using , and . keys. X takes aim for one frame (this frame is in sync), the shot leaves X's gun one frame earlier and the difference is 3 frames when the shot touches the screen edge. Note that the youtube video is 60fps (right click, stats for nerds) so there could be a one frame error in this comparison

[TheJesusFish]

Ahh good catch. More joy in the world of CX4, it seems. Thanks again for the video @AkiteruSDA.

[birdybro]

@AkiteruSDA Does changing Initial WRAM or Initial ARAM change the behavior at all?

[AkiteruSDA]

Changing initial WRAM and ARAM doesn't appear to have a visual impact on the lag frames.