Windows Central has received documents alluding to a Microsoft and Razer partnership for bringing keyboard and mouse support to Xbox. The presentation involves the peripheral maker’s sofa-friendly Turret combo and BlackWidow Chroma, whose RGB lighting can be configured to work in Xbox games.
The presentation also details some rules and guidance for developers on their implementation of mouse and keyboard support for Xbox. Gamepad support is still a requirement for all titles, and the Xbox can only support one mouse and keyboard per console, unlike gamepads, of which it can support several.
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Source: [H]ardOCP – Microsoft and Razer Might Be Working on an Xbox Keyboard and Mouse Partnership