Apple Wireless Keyboard the initial release. The new model now uses only two AA batteries instead of three originally. Additionally, Mac OS X 10.5.8 is now the minimum OS over the original Mac OS X 10.4.10. This model of keyboard became standard with new generation of iMacs introduced on the same day. On July 20, 2011, following the release of Mac OS X 10.7/OS X Lion, Apple updated the keyboard slightly, updating the label on the Exposé key to Mission Control and changing the Dashboard key to a Launchpad key. Keyboard layouts with a rectangular Enter key are available in American English and
Keyboard layout a cause of the divergence between the bit-paired keyboards found in the 1960s and 1970s and the typewriter-paired keyboards that are now standard in the US. This change was made because smaller characters hit the paper with less force, and consolidating smaller characters such as '" into a pair on a single key avoided needing to adjust the force based on shift state. The standard 101/102-key PC keyboard layout was invented by Mark Tiddens of Key Tronic Corporation in 1982. IBM adopted the layout on its PC AT in 1984 (after previously using an 84-key keyboard which did not have