9 games in total;Isn't that fewer than 5 games total?It does have the 3.0 cd card internal, so all super cdrom games play fine.But not the arcade card duo and pro, for those you would need the separate cards indeed.It'll work as the basic CD card. Don't think it does super cdrom, but could be mistaken on that. Been a while since I checked on that one.
It also won't work as the arcade card duo or arcade card pro.
https://necretro.org/CD-ROM²_systems#List_of_games_3