Let say, I have a complete ROM SET for Version 89. Then .90 comes out and when i run CLRMAME, I just want whats missing from the 90 from 89 and save it separately in a directory/folder.
Let me see if i can clear it up more.
I have complete 89 rom in /v89 folder
Then v90 comes out and use CLRMAME program
It then looks at the /v89 folder and compare it to this v90 and save the differences in /v90 folder.

"Its not what we can do with MAME, its what we can do for the MAME Team"