funkatron

I use Homebrew for package management, so the instructions here work with that. You could probably get p7zip and atool another way if you want.

1. install p7zip with homebrew: brew install p7zip
2. install atool with homebrew: brew install atool
3. extract individual files from .7z archives to current directory: atool -X . -e -E *.7z
4. delete or move the .7z files: rm *.7z
5. archive each file into its own ZIP archive using find and atool: find . -d 1 -type f -exec atool -a -F 7z -E -e {} ';'
6. delete the uncompressed rom files. They should have a common file extension, which you'll need to change depending on the ROM type. For example, I needed to delete a bunch of .gb and .gbc files: rm *.gb; rm *.gbc