For collectors, a "0.139u1 ROM set" refers to a collection of ROM files that are specifically verified, named, and structured to be fully compatible with MAME version 0.139u1. Understanding this set provides insight into a transitional period in MAME’s development.
The "bread and butter" of any MAME set. These are tiny files (usually under 200KB) that run flawlessly. mame 0.139u1 roms list