I have fairly thoroughly scoured the posts for the last few months, and I can't seem to find any answers....

Every game that i get, including DKong and Pacman, as well as Contra and Bubble bobble, shows up in my games list, but when i run it, i get a black blank screen, then it cuts back. I have lots of memory free (i'm running a Jornada 548 with SH3 processor and 32MB ram) but still nothing. Actually contra gets past the liscensy screen before it cuts out, but not much farther. The other ones are dead on arrival. Any help would be much appreciated. Thanks

-DaveyJ