You still haven't really told us exactly what's happening beyond "it doesn't work". What is going on? Are all these games locking up at a black screen, or not loading at all, or what?

One thing you may need to keep in mind is that in a lot of cases, you're better off getting cracked copies of games rather than the original. Some of the more aggresive forms of copy protection still don't work well in emulators. Remember and Nostalgia are two of my favourite cracking groups out there, and both of their web pages have download links on them so you can get disks you KNOW work. Though keep in mind that both groups are European, so you will probably have to set your emulator to PAL if you haven't already (I know at least a few crack intros cause my real life NTSC C128 to lock up).

--Zero