For Mame 0139u1 | Roms

Understanding ROMs for MAME 0.139u1: The Ultimate Compatibility Guide

6. Legal and Ethical Considerations

2.2 ROM Images: Definitions and Types

• Plain ROM dumps, merged/split sets, CHD (Compressed Hunks of Data) for disk-based media.
• Common archival formats and naming conventions used by MAME in that era.

4. Where to Get "Good Content" for 0.139u1

Because this is an old version, modern "full set" torrents won't help. You have two options: roms for mame 0139u1