MAME uses a "Parent/Clone" system to save space . For version 0.119: About ROMs and Sets - MAME Documentation
The hard drive was a relic. A dusty, chunky 80-gigabyte Western Digital that clicked three times on startup, a sound Leo found more comforting than any lullaby. On it lived a perfect, frozen moment in time: the MAME 0.119 ROM set. mame 0.119 roms
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Released in September 2007, version 0.119 represents a "sweet spot" for many legacy builds and handheld emulators. Here is why this specific version remains a staple in the emulation community. 1. Performance on Lower-End Hardware MAME uses a "Parent/Clone" system to save space