In iChat and the Finder requires a 128-Kbps Internet connection (300 Kbps recommended). Receiving HD video calls requires a supported Intel-based Mac. Making HD video calls requires a built-in FaceTime HD camera and a 1-Mbps upstream and downstream Internet connection. FaceTime :- Video calls require a built-in FaceTime camera, an iSight camera (built in or external), a USB video class (UVC) camera, or a FireWire DV camcorder and a 128-Kbps upstream and downstream Internet connection.Backdrop effects when using a DV camcorder require fixed focus, exposure, and white balance. Photo Booth: Requires a FaceTime or iSight camera (built in or external), USB video class (UVC) camera, or FireWire DV camcorder.Time Machine :Requires an additional hard drive or Time Capsule (sold separately).For instance, if your MacBook was released in 2014, don’t expect it to run any OS released prior of that time, because older Apple OS versions simply do not include hardware drivers for your Mac. If you have a newer Mac, there is no physical option to install Mac OS versions older than your current Mac model.
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