@zing thanks for your reply. I've tested in both version with some results. But I've read that someone play it without lag so I thought it's possible to have a good result with rpi4 too.

Hello I need your help.
How I can get carnevil works on rpi4 without lags?
Which kind of setup core I've to use with mame 2003 plus?
Same question for virtua cop
Thanks

@rustymg sorry I need your help.
How I can get carnevil works on rpi4 without lags?
Which kind of setup core I've to use with mame 2003 plus?
Some question for virtua cop
Thanks

@rustymg now recalbox seems to be crashed!
No rom starts nes nor snes no mama. Same things happened only to me?

@rustymg how? I mean carnevil and virtua cop I. E.
Thanks

@rustymg rpi 4
With exception of saturn. They are more or less ones indicated in wiki recalbox https://wiki.recalbox.com/en/basic-usage/features/lightgun-on-recalbox/games-compatibility-list
So you should consider emulate snes, dreamcast, nes, ps1, Naomi, megadrive, 3do ( not perfect), sega cd etc.
My failure and pain are carnevil, virtua cop2/3

@rustymg it works if you disconnect and riconnect the bar after launching rom!!!
I spent two weeks....

@rustymg if it's could help you, please consider that point blank (my favorites one) game series and lethal enforce are well emulated and playable on psx emulator of recalbox. Consider also Naomi games are very pretty. I'd like to continue run mame for older games like exidy ones (crossbow, Cheyenne etc). If it will start to works again I complete my working collection of lightgun with more than 100 roms.
Stay well and thanks

@rustymg
thank you very much for the update. I don't know if I understand correctly: so if I start the roms without dolphin bar and then, after the start ,I connect it, the roms work? and can I use the lightgun?
to think that I was behind it for days!

Same problem!!
Not working a lot of lightgun games that have worked until update.allnroms verified and fitting on mame version
I. E. Nycaptor, lethal justice, crossbow, chiller, Cheyenne, under fire and so on. about 80%.

Only still working are jurassic Park and alien gun