OS X® Mountain Lion, the ninth major release of the world’s most advanced operating system, which brings popular apps and features from iPad® to the Mac® and accelerates the pace of OS X innovation. Mountain Lion introduces Messages, Notes, Reminders and Game Center to the Mac, as well as Notification Center, Share Sheets, Twitter integration and AirPlay® Mirroring. Mountain Lion is the first OS X release built with iCloud® in mind for easy setup and integration with apps. The developer preview of Mountain Lion also introduces Gatekeeper, a revolutionary security feature that helps keep you safe from malicious software by giving you complete control over what apps are installed on your Mac. The preview release of Mountain Lion is available to Mac Developer Program members starting today. Mac users will be able to upgrade to Mountain Lion from the Mac App Store™ in late summer 2012.
OS X Mountain Lion requires a Mac with a 64-bit kernel. Mountain Lion supports the following Mac models:
• iMac (mid 2007 or later)
• MacBook (13-inch Aluminum, 2008), (13-inch, Early 2009 or later)
• MacBook Pro (13-inch, Mid-2009 or later), (15-inch, 2.4/2.2 GHz), (17-inch, Late 2007 or later)
• MacBook Air (Late 2008 or later)
• Mac Mini (Early 2009 or later)
• Mac Pro (Early 2008 or later)
• Xserve (Early 2009)
In hardware and software development, a golden master is the reference model from which copies are mass-produced. An analogy is made to the production of certain types of physical media. In that process, a mold is cast in gold, from which subsequent copies are derived.
The golden master is usually the release to manufacturing (RTM) version, and therefore the first public/commercial version. It represents the development stage of “RTM” (Release To Manufacturing). Reaching this stage is said to be “going gold”, or “gone golden”.