The single file launcher for both scummvm variants (native/libretro) can be achieved like this:

Make a folder with the ScummVM Game Id with the extension, thus sword1.svm in the roms/scummvm/ folder. Put the gamefiles into that folder, and add no *.svm in here Run scummvm from ES, select Add Game in ScummVM, select the folder sword1.svm you just created Remember / note the gameid provided by ScummVM autodetection (maybe sword1-win-gb, e.g containing some variants information)

Now, if the game id from autodetect is different than your created game id folder, there are two options to rectify the situation:

Either edit the scummvm.ini (in /opt/retropie/configs/scummvm) and change the ini section name from [sword1-win-gb] to [sword1]

Or rename the game folder from sword1.svm/ to sword1-win-gb/ in the filesystem.

You may encounter files (not directories) with the extension *.svm directly below the roms/scummvm/ folder. These are caused by the lines in +Start ScummVM.sh:

while read id desc; do echo "$desc" > "/home/pi/RetroPie/roms/scummvm/$id.svm" done < <(/opt/retropie/emulators/scummvm/bin/scummvm --list-targets | tail -n +3)

Disable/remove them to avoid having these re-appear after each ScummVM run.
Remove also the files *.svm with find $HOME/RetroPie/roms/scummvm/ -name "*.svm" -type f -exec rm -f {}

Important: Key is to have the game id folder name match the entry in the scummvm.ini for the native ScummVM the game id derived from the folder is passed to ScummVM.

In contrast lr-scummvm does not rely on *.svm files/folders at all. (Technical details: When launching lr-scummvm the absolute path of the game is passed to the libretro core. The core then searches for a *.scummvm (sic!) file with the game id in that path, if that is not found it falls back to autodetection.)

With this setup Skyscraper will detect and scrape the games properly.

Epilogue:
Also keep in mind that ScummVM and lr-scummvm are using scummvm.ini files in different locations.

ScummVM: /opt/retropie/configs/scummvm
lr-scummvm: $HOME/RetroPie/BIOS/scummvm

This setup works but may be a awkward (imposing file/foldernames, many manual steps in the right order, possibility of diversion of scummvm.ini files). Thus I came up with a more user-friendly approach, you may read the gory details in this thread

@Protocultor Ok thank you

Can you please add more info about your setup and emulated game/emulator, as outlined in https://retropie.org.uk/forum/topic/3/read-this-first ?

@mitu This is SO helpful. Thank you so much for taking the time to share this info. I genuinely appreciate it.

@jetcold0 I haven't see something about this project, it looks that they are offering openmohaa-v0.61.0-linux-armhf.zip . Maybe it is possible to run this in a Pi but i don't know how.

Because I just beat the windows version and loved it, it is on my mind.
Xanadu Next, originally an Nokia NGage game released in japan 2005, by Falcom whom also brought us Ys series and Dragon Slayer.

Loved the game, not sure differences in the windows and ngage version, id be surprised if there is an english translation for ngage. I barely handled an ngage when my friend had one, and it does seem kinda surprising that the handheld back then could run that game.

There is an open source symbian os/ngage emulator out there, recently released on Google Playstore.

Anyways that is my hidden gem of the day. If you like classic/midretro Ys check out Xanadu Next.

Please don't double post - I've merged both your topics.

Regarding your issue - still waiting for the picture you promised and the info requested in https://retropie.org.uk/forum/topic/3/read-this-first.

@Rocket I would suggest probably a different rom source. If these are for sure known-good roms (for example working in another emulator on a PC), then please supply a verbose log of one that isn't working in RetroPie.

https://retropie.org.uk/docs/Runcommand/#launch-with-verbose-logging

@mitu Thank you. I went thru the link you mentioned. I think I can follow the instructions on how to set it up. The main problem I have is how to configure buttons that I have available. By default, the emulator looks to be set for keyboard so I need to reprogram all the buttons and the joystick as the keyboard is not connected to the system. I just don't know what options to set for each button so I can launch a game, play it and then come back to the emulator to select another game.

As to the screenshot, it is Batocera but I am just trying things. Have same problem with button setup in Retropie as well.

@Floob Thanks! & Interesting indeed it is... especially that it also falls back to what I may call classical/true retro titles within the "of all time" question and is in no case (so far) mentioning "truly" inovative or otherwise noteworthy titles which may not have been among the best, but are memoriable on their own accord (sidenotes/anectodes a human writer may have opted for to supplement/beefing up the answer). Somehow I got the feeling that a) answers of other versions of this question are somewhat anticipatable and that with more questions/answers to compare they will feel more and more generic instead of genuine ones ;)

@raspberry79 said in display issue:

Is there a site that tells u what each folder is.

You can find it here or by looking in the emulator's doc page.

@kazuuu
You could install a port from the setup script and it’ll create one for you at /home/pi/RetroPie/roms/ports. I would assume you could just create your own folder there but not sure if there’s anything else that would need to be created for it work? Installing from the script would make sure everything was made and you could always delete the other game after the folder was made.

@mitu I just check it, doesn't work that way.

@em you have to give more information.
What Pi, which version of retropie, which emulators, which roms,....
Please read this: https://retropie.org.uk/forum/topic/3/read-this-first and fill out all the requested informations.

@jnbridges and you could always use something like this to get that arcade sound you were talking about.