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Is its possible to use an SNROM board for reproduction of an SBROM game? If yes, are there changes that have to be made? Thanks!

Many thanks. You guessed almost correct. It was A16 that had a loose connection.
Thanks for your help!

I have put sockets in a TKROM board (Shadowgate). Now, when I put Shadowgate on the Eproms everything works fine. So, the soldering should be ok. However, if I put either Kirby or Mario Adventure on the Eproms, I get a very glitchy graphic. The game plays but only very glitchy. Does anybody have an ...

I guess you all know this trick where you put a Tennis cartridge in the Famicom toploader, leave the system on and then put a Super Mario cartridge in. 256 hidden or rather glitch levels appear. I wonder if this would work also with a european NES. As I got it the reason it does not work is the lock...

That was it!! Many thanks! Very friendly community.

All the effort for... Wild Gunman...

Many thanks, that helped. Now, I used Wild Gunman. And it runs. It even reacts to the lightgun. Except that the background graphics is missing. Please see image. I tested all connections a thousand times. Does that mean the chr eprom is somehow distorted? I'm reluctant to de-solder everything... IMG...

Thanks, rainwarrior. You are right, I did not fill up the rest. For a beginner, how do I do that?

@ lidnariq: I will check that. Thanks!

Hi. I've tried my first cartridge reproduction. I used Super Mario 1 as donor cartridge and copied Galaxian on the Eproms. I tested all connections. However, the screen remains blank. LED on NES is on and not blinking, but is only dim. Does anyone know why this doesn't work? Thanks!