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Thank you very much for the info. I'm going to chalk this up to a bad CHR. When I erased it, I noticed it took a lot longer than expected. I'll have to order more EPROMs before I can test a new CHR, but I'll report back.

The donor was Shadowgate. The ROM was the PRG1 SMB3. I used an AM27c040 for the PRG and an AM27c020 for the CHR. Both programmed and verified correctly. I did have to write the CHR at a slower speed, as it failed on the first attempt (I erased it and verified it was blank).

I should add that I did thoroughly clean the contacts on the cartridge

Hello, I'm fairly new to making reproductions, but have been successful on my previous attempts. I'm currently working on Mario 3mix and am having an issue with the graphics being scrambled. The game and sound work otherwise. What's strange is the title screen appears normal for a split second befor...