I finally got these controllers working after completely wiping my SD card and rewriting the Retropie image. The only difference this time is that when running through the update I didn't update the underlying kernel, only the Retropie packages. The only reason I did this was on the previous setup this caused several issues such as having to log in at power-on. These were easy to fix but I didn't feel like dealing with it.

Adding this line to Mednafen VB.cfg:

video_refresh_rate = “50.0”

Fixes the timing issue, hope this post helps anyone with the same issue. Runs great now!

( btw, definitely lower the audio_out_rate to around 33200 or something like that, and sample fidelity to lower and add some audio time skew, no framedrops or sound skips now that I could notice even when playing in 3d )

@shoebox low voltage can cause big problems, underclocking is one of them. I would skip the canakit power supply as they are one of the less reliable and go straight to the official raspberry pi power supply.

@ccaveman84 Thanks for confirming the fix.
@buzz maybe we can modify the splashscreen service to start after the local-fs.target ? I can submit a PR.

Thank you.

@mitu I figured it out.
Also, do the psp eboot games run slower than the normal bin and cue format? Parasite Eve II runs really slow, A lot of lag on the psp .pbp eboot.

Oh sorry misunderstood. Well, it's a little bit all over the place. Before overclocking, one TV I tried had 720p. It had occasional audio cut outs. Another TV had external speakers and had a resolution of 1920x1080. That one had terrible audio drop outs that lasted the longest. The last one I tried was at 3,840x2,160 and was working better than the other two. The audio dropouts were there but they didn't last as long.

Since that 720p TV still had audio drop outs, I don't think that could be the solution. But I haven't tried changing the resolution for any of the TVs so I'm not 100% sure.

@omen_peter oh yeah, you right. I thought he meant that it literally didn't work, despite typing in "raspberry" and hitting enter

Yeah, that is the page where I read about the workarounds :) I was a bit unsure if there were other differences to think about, but it sounds like it is safe to go for a multiplayer adapter. Thanks for the info.

Thanks yes I'd already done that. :-) I also added lr-mupen64plus and made a couple of tweaks in the audio settings there, such as setting latency to 128 rather than 64, and setting the resampler to lowest rather than lower. Seems to take the edge off lag sometimes.

@Undistaya Glad I could help :)

@mitu than you so much. so all these roms are to heavy for the pie...time to free resources..
thanks again!

@Link You can create a folder for the ROMs on the /media/usb0 partition, copy the contents of /home/pi/RetroPie/roms to it, then symlink /home/pi/RetroPie/roms to the folder on the HDD. Make sure you create a back of /home/pi/RetroPie/roms first, just in case.

Or you can bind mount the folder over /home/pie/RetroPie/roms with something like

mount -o bind /media/usb0/<Folder_name> /home/pi/RetroPie/roms

@omegal98 it did not work but tried emulationstation that worked until I exited out of a game and it brought me back to the retropie login. Is there a command to stop that from happening I appreciate your help.