Re: Other sites of interest
Sadly, Progetto EMMA stopped getting up-to-date long ago, so this other will do in order to know every machine's video mode according to MAME's latest version (with several screencaps to know the actual in-game resolution), the driver changes (per-MAME version), as well as full romset information and requirements:
Arcade Italia's Arcade Database
In order to quickly know the latest BIOS nomenclature and related stuff, I found this site quite good as well: