Using MAME
> Once you've built defender you can now use the rom files in the `redlabel' directory to play defender on MAME. If you're on Ubuntu you can also install MAME with apt:
> sudo apt install mame
> Once you've built defender you can now use the rom files in the `redlabel' directory to play defender on MAME. If you're on Ubuntu you can also install MAME with apt:
> sudo apt install mame
The post then says:
> You can also assemble it into the 11 rom files that would have been loaded onto the arcade cabinet’s ROM board.
If I wanted to run this on an emulator, surely the assembled code would be identical, but the use of the word "also" suggests they are doing something else here.