Now thats a good idea to think of a programme that makes converting Mame drivers into FBA format easier even better is to actually
go ahead and create such a programme
How id love something like this for Mame a tool that easily allows you to roll source code either forwards or backwards between versions
say make Mame84 the base source and take some driver/video/sound/cpu source files etc from the latest mame sources
run em past a programme that converts them into files that can be simply implanted into a previous source