From Cheetah to Mountain Lion
The official OS X story starts with a cat, but the excitement began with a bear: Kodiak, the $29.95 beta of Mac OS X, which introduced the new OS and its groundbreaking, “lickable” Aqua interface. It expired in May 2001 but by then Cheetah was out of its cage.
Mac OS X 10.0 looked and worked unlike any previous Mac operating system. Based on the Darwin Unix-like core and the Open Software Foundation Mach Kernel, it had full pre-emptive multitasking and memory protection, and it had a command line interface in the form of Terminal.
It was also demanding. When many Macs shipped with 64MB of RAM,
