you’re the man floob!
I have tried two, area51 and killer instinct.
I got the CHD’s as part of a 106 complete rom set. funny thing is that it isn’t saying its the wrong rom or checksum, it says the file does not exist.
again, I have tried the CHD file in the roms folder. also tried it in a folder with the same name as the CHD, and that folder in the roms folder.
really interested in your results. thanks again for everything!