I did a memory test with NES test rom (or whatever name it is).
Altough I didn't see properly the graphics (I only have an UNROM testboard) the sound it made is quite similar to what I hear on an emulator.
With this in mind I'm assuming this test went fine.
Another interesting thing I noted is that it becomes worse if I try using the GameGenie with it.
Rockman 2 reboots as soon as the screen fades after the helmet appears on Rock's head.
With Gradius I got the same results and without the Genie: I just can't start the game at all.
This is what the Rockman's repro looks like on the component side
and the solder side
Just in case someome wants to take a look.
The only thing I removed was the resistor, since it seemed to be redundant.
Could a small alteration on the clock generator result on this?
I've tested with a few more games: Battletoads, Q*Bert, Gyruss, Kings of the Beach, Fester's Quest Journey to Silius, Metroid, Bionic Commando, Life Force and Gradius 2. All played just fine. If someone suggests a specific game to test, I'll try to get the game make it.
It would be nice if I could get anoher Gradius and Rockman2 to test, but unfortunatelly I couldn't find anyone around who had it.
I'll post again if I have any other news.
I think I'm probably missing some detail on this weird defect...
For now I'm out of ideas again. Any suggestions are welcome!