I got myself an NES some time ago from ebay and tested it now. The problem in general is, that the color palette is really pale and you can hardly read any text ingame like that. Does somebody know an solution to that or even why the problem occurs? I already tried the method with the two games in the slot, but to no avail.
Here are some photos to compare to the originals
[image|2710317]
[image|2710318]
[image|2710319]
[image|2710316]