@mitu I see thx, so do you think this is very specific or maybe more common and with more roms? or do you even know of a compatibility list of lr-gpsp?

Problem solved, I don't know if this is a general "issue" but the filename had double spaces in the file name . Deleting one and the rom worked.

@dankcushions said in GBA Not Launching (bios added):

update retropie-setup script, then install lr-gpsp from source.

Fantastic, took a while, but that's fixed it!

Apologies for not spotting the earlier post, I was scouring through the tag PI ZERO W rather than RASPBERRY PI 0W

No, it's not specific to the RetroArch version, overrides don't save the hotkey configuration, it's saved only when saving the whole configuration.
You can try to add an extra configuration line in /opt/retropie/configs/gba/retroarch.cfg with

input_toggle_fast_forward_btn=X

where X is the button input code for L2 - you can find it from your gamepad autoconfiguration file in /opt/retropie/configs/all/retroarch-joypads/<gamepad.cfg>.

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I downloaded the portable version of PokeMMO and put it in the roms/ports folder and I get this error. Would anyone know a fix for this?
https://pokemmo.eu/downloads/portable/

@TedMaul About Wario Land, I played 1 and 2 and the second game is brilliant and by far better. Its a really good top notch Nintendo quality game, which should say a lot (Quality of Seal 👌🏻). Can't say much about the other parts, as I didn't play them. From my brief experience the third one seems to be good too.

Hey guys

I followed your advice and I'm pleased to report that GBA games are now working under the other emulator and they are working really well. No more stutter! Thank you! Finally my GPI can run more than GB games! :D

I've had this problem recently with Legend of Mana for psx. It was the controller type that was set to analog, but the game refused to work until I changed it back to standard and restarted it. Some cores/games are a bit finicky with analog controllers and how they're configured, in my experience. Try messing with that option to see if solves you problem.

The BIOS started the games. Thanks @mitu!

Okay, so now I'm getting blanking AND random "No Signal" to the TV. The no signal issue recovers when I exit the game. Could it be my seven dollar HDMI cable?

Thanks all for your help. I found a good image for the Pi0 and dont have any problems now :)

Image: Super RetroPie

Try gpsp's non-retroarch version. With this version, you'll probably have less lag on GBA games, since it consumes less resources than the default retroarch version.

I've tested this version on a Raspberry Pi 1 B+, and I remember playing some GBA games without lag. It was on 2015, and back then, if my memory serves, there was no lr-gpsp yet.

I don't know if it'll work on your Pi Zero, but assuming Pi Zero and Pi 1 has approximately the same hardware, there's the chance that it can work.

Thanks for the reply! I installed Retroarch on my phone to see a bit of what you mean. Fewer shaders are available and the same shaders I use on my PC look different thanks to the phone's much higher PPI, and/or maybe some other factors. I suppose this would mainly apply to people playing on Windows or Linux on a 1080 - 4k screen. If you feel this question is of no use here, feel free to remove it.

You emulators.cfg for the gba system is corrupted. It should be:

lr-mgba = "/opt/retropie/emulators/retroarch/bin/retroarch -L /opt/retropie/libretrocores/lr-mgba/mgba_libretro.so --config /opt/retropie/configs/gba/retroarch.cfg %ROM%" default = "lr-mgba"

Replace the file with the contents I pasted above and re-try.

Roms are all working on my PC.
I realize it was just a issue during the transfert of the rom to my raspberry, now it should work.... but actually my raspberry pi seems not to respond to my SD card.
I tried to reboot on the new retropie IMG, and nothing. Green led blink twice, then nothing.... when I try the same SD card on another pi It's working.

If you have any advice for this issue, that would be great.
You already helped me a lot. Thank you.

@drago-supremo The default settings - of the RetroArch included in RetroPie - is to use and preserve the apect ratio of the emulator used, scaled to the resolution of the your output.
If you still want to change it, you can use the Runcommand launch menu (https://retropie.org.uk/docs/Runcommand/#runcommand-launch-menu) to set the resolution per core (emulator) or game.