All those -verifyroms errors indicate that you need different files. You're right that the NO GOOD DUMP KNOWN stuff is not a problem, but you'll notice that each of those sets also has an INCORRECT LENGTH error on a different file - that's why it's saying they're bad.
I know some ROM files have INCORRECT LENGTH. So i have to use fake files with needed lenght to outsmart the verify option. Change the newbrain: cop420.419 (1024 bytes) - INCORRECT LENGTH: 8192 bytes newbrain: 8248r7.453 (4096 bytes) - NOT FOUND - NO GOOD DUMP KNOWN romset newbrain is bad to newbrain: cop420.419 (1024 bytes) - NO GOOD DUMP KNOWN newbrain: 8248r7.453 (4096 bytes) - NOT FOUND - NO GOOD DUMP KNOWN romset newbrain is best available
If no dumps with correct file size exist, will be this not the same if i use a fake file with right file size or not ? The rom set is best available.