I made a snapshots collection (in game + titles) based on Mame Software list set.
It should appear soon on Progetto Snaps website, or you can get it here.
It’s covering around 1600 sets on a total of 2600 right now.
Most of them come from this website and some from this one here.
1 pic for 1 set (zip) named along Mame conventions (usually 8 characters but… sometimes not). This can be used in Mame directly or as a basis to rename them with scripts along the xml database (in the hash folder).
As it can be a bit tricky to use in RetroArch as is, I’m sharing a renamed set with a playlist displaying full names for each zip.
It won’t save you the step to unzip a particular set containing multiple disks to use them with Np2kai though.
You’ll have to:
-drop the “NEC - PC-98 Disk” folder into RetroArch thumbnails folder
-edit the playlist with a tool like notepad++ to replace the rom path with yours
-put that playlist in the playlists folder