I found out that the problem is caused by shader I applied to all liberto emulators, I guess Atari800 emulator doesn't like shaders. Disabled it for this specific emu and it's working now! Thank you mitu for answer.

Thanks for the input everyone. I've got a handful of working games and I'm happy with that for now. I have far more on my Linux tower RetroPie build that is more fit for this kind of thing.

@mitu I transplanted the configurations from a newly installed Retropie card to my existing installation, and have lr-atari800 working again. Thanks

The BIOS started the games. Thanks @mitu!

@mitu IT WORKS! Thanks for your help it works very well!

@jbuente I got this game to run from a non-merged mame 0.78 rom pack, indytemp.zip, 352kb. I think you may be using a rom from a merged rom pack, as the errors seem to indicate mame is looking for parent/children roms. Before I eventually found it from the non-merged pack, I was using the German version. It works perfectly, other than the spelling is in German.

@mitu I have been trying to run Flink(U) and Dragon's Lair @quicksilver thank you, I was going to try that it's nice to have a confirmation beforehand

Hmmm im getting to a point that i think Reinstalling retropie will maybe help what do you think about reinstalling ?

@mitu Oh ok, that’s a bit of a bummer. At least I know why it doesn’t work though. No big deal, I mainly use it for MAME anyways. Thanks for all your help!

Self-Solving Problems Department: the trick is to put "cocoe" in the EMULATORS.CFG line rather than "coco"...

@dmmarti It was simpler than that - I'm a dumdum and I had so many folders with CoCo BIOS files in them from when I was trying to get it work that I'd added the Extended Basic ROMs to every folder except the right one :D

@ciano said in Atari 5200 Not Working - "Atari800/OS Emulation Halted": @Thorr69 Thank you so much! Happy to help. =)

This info is covered already in the Docs - including where to copy the BIOS files, since RetroPie already configures RetroArch. Note that some games have issues when the 'boot to BIOS' option is selected in lr-pcsx-rearmed.

@Smythius said in Intellivision was working and doesn't now.: I think quicksilver may have found your issue as your BIOS files should be in /home/pi/RetroPie/BIOS/ and your setup appears to want them in your roms folder. You could try copying them there if they are not already and see if it works. My Intellivision retroarch.cfg just points to the global one in /opt/retropie/configs/all/retroarch.cfg I dont have any custom values in it other than the input remapping (maybe you have something else?) in the global file you should have system_directory = "~/RetroPie/BIOS"

@mitu thank you Mitu!!! 👍😎 The BIOS Files are in the rom folder of "AdvanceMame". It were about 40, which i renamed to (i.e.) "ZZZ BIOS - CPS1" to get them all together on the bottom of the gamelist and hide them. As mentioned the only two ones that are still visible since a couple of weeks in full mode are Akklaim PSX and Naomi. It does not really disturb me!!!, but i will Post the filenames as soon as i am back on my Pi 😉

@PCKid The .cfg files don't go in the ROM folders. Remove the /home/pi/.atari800.cfg file, make sure you've copied the right BIOS files and then start a game.

I am having issues as well. I tried configuring the joystick.cfg by manually mapping as instructed and I also reset my emulation station controller inputs (so it auto configures reicast) and it still didn't work. This has been an ongoing issue for years now, they should update this emulator. My only other alternative is to overclock my pi and pray lr-flycast performs better. Otherwise, I am stuck.

@RetroDuck Re-read the forum rules - there's no download links to ROMs or other copyrighted material.

@rafioso24 There's no asking/sharing copyrighted material in the forums - https://retropie.org.uk/forum/topic/2/forum-rules.