Emulators
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MAME
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MAME is a multi-purpose emulation framework.
MAME's purpose is to preserve decades of software history. As electronic technology continues to rush forward, MAME prevents this important "vintage" software from being lost and forgotten. This is achieved by documenting the hardware and how it functions. The source code to MAME serves as this documentation. The fact that the software is usable serves primarily to validate the accuracy of the documentation (how else can you prove that you have recreated the hardware faithfully?). Over time, MAME (originally stood for Multiple Arcade Machine Emulator) absorbed the sister-project MESS (Multi Emulator Super System), so MAME now documents a wide variety of (mostly vintage) computers, video game consoles and calculators, in addition to the arcade video games that were its initial focus.
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Gens
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Gens is a win32/unix Sega Genesis / Sega CD / Sega 32X emulator.
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Kega Fusion
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Kega Fusion, also shortened as Fusion and initially named Kega II, is a multi-system emulator for Windows, Linux and Mac OS X developed by Steve Snake. It is the follow-up to Kega Lazarus, and is the last in Steve Snake's Sega emulators after KGen, KGen98, Kega and Lazarus.