Instead of hunting for a 0.78 set, consider:
was released in December 2003 . It is considered a historic milestone release because it was the last version supported by popular front-ends like MAME32 and the foundation for many arcade-focused retro distributions (e.g., the MAME 0.78 ROM set is famously used with FinalBurn Neo and certain Raspberry Pi images). mame 078 rom set download link
The most reliable source for this specific version is the , where the community maintains "Reference Sets" for preservation: Instead of hunting for a 0