Interesting concept. I understand what you're trying to do but not how you want to approach making it happen. The easiest way would be to just put the unique games in your collection and the romlists will only contain unique games to that platform/system. You can also use filtering or tagging if you have more than unique games in your collection.
At any rate, if you're simply asking how to figure out which games for which system, these are couple of examples that should help and I think you'll find the rest by simply changing the system name in the search.
I Googled "nes exclusive games list" and this was in the top 5 results https://en.wikipedia.org/wiki/Category:Nintendo_Entertainment_System-only_games
I Googled "snes exclusive games list" and this was in the top 5 results https://en.wikipedia.org/wiki/Category:Super_Nintendo_Entertainment_System-only_games
I Googled "sms exclusive games list" and this was in the top 5 results https://en.wikipedia.org/wiki/Category:Master_System-only_games
I Googled "genesis exclusive games list" and this was in the top 5 results https://en.wikipedia.org/wiki/Category:Sega_Genesis-only_games
I don't know if these list are 100% accurate but at a glance they looked pretty good.
How will you decide which system rom you will use when it's not an arcade game but was release on multiple other systems? Will you just not include these games?
Thanks my friend. Your links are helpful although i almost did the same Google search like you.. But i still wasn't sure if many of them are also in arcade, because i try some and search. In some cases i found similar or exactly the same in mame.. But i suppose most should be unique.
I also thought of the problem that some of them may be in multiple consoles. I suppose I'll choose the one it looks better or choose random..
Anyway that's why i asked to see if someone has already created a list for this, so to make things easier.
If anyone has done it, post your list, as i believe many wants to do something similar.
I also find out that there are many 2d psx1 games. I think i found a video in YouTube with 100 better (most of them was 2d). I target 2d, because if you want 3d games you probably can play them in playstation or Xbox.
This is for keeping all the old 2d games.
Anyway if i start it and create a list, i will post it here.
Thanks again.