<P> Xbox 360 backward compatibility uses a "Fission", a software emulator within the system software; 104 Xbox 360 titles were supported at the feature's public launch, with more added in the following months . Xbox 360 games contained within Rare Replay are packaged as standalone applications using the Xbox 360 emulation . Microsoft stated that publishers would only need to provide permission to the company to allow the repackaging, and it expected the number of supported games to increase significantly over time . Microsoft, along with fourteen other third - party publishers, will offer supported games, and all Games with Gold titles on Xbox 360 since November 2015 are made compatible . </P> <P> Xbox division head Phil Spencer had also hinted the possibility of adding support for games from the original Xbox . For the backwards compatibility team, after they completed the framework for Xbox 360 compatibility so that other engineering teams could take over, they turned to the question of compatibility with the original Xbox console . The program was started in November 2016, under the code name "Fusion", and was led by software engineer Spencer Perreault . Perreault initially tried the same approaches as the team had done with "Fission", but due to the differences in memory management sizes and chipset bit - rates, these initial tests failed . Instead, Perreault worked to bring "Dolphin", a developer tool for the original Xbox, working to get its emulation correct . La Chapelle brought in a number of personal Xbox titles to test in Perreault's emulation, getting about a 10% "hit rate" on successes, though the variety of failures helped Perreault to identify common problems, and within a month, had improved the successful hit rate to about 90% . As with Xbox 360 backwards compatibility, the Fusion emulation enables Xbox games to be scaled to 1080p resolutions, work with Xbox One networking features, and can allow mixed - console System Link connection between all three generations of Xbox . </P> <P> With Perreault's success, Microsoft announced the Xbox backwards compatibility on the Xbox One in June 2017 . Thirteen titles were initially released on October 24, 2017 . Microsoft announced an additional 19 titles to be added to the Xbox One service during April 2018 . </P> <P> Microsoft does not anticipate that there will be as many Xbox titles brought to the program as with the Xbox 360, primarily due to legal issues related to intellectual property, contracts, and companies that have since gone defunct . </P>

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