apple software based designed developed use company computer range prepare computer use loading required device drivers starting mac running mac operating system later versions read memory rom computer chip containing graphical shown briefly compatible computers grey apple logo spinning appears sequence program freely available darwin operating system open source superseded nearly identical named interface rom release based mac history dating utilized basic solely rom chip varying sizes contained computer code boot computer run mac operating system known old world rom differs greatly design modern generally use hard drive large capacity store operating system computers advent series updated rom reduced size called remainder rom moved file mac rom stored hard drive rom implementation standard contained named new world rom release mac rom file replaced file release mac historical happy mac start picture replaced grey apple logo introducing replaced near identical interface rom apple calls file features boot appealing operating system developers apple added features allow flexibility process network boot load boot volumes boot manipulated holding key combinations alter process functions include achieved holding command key replaces default apple logo text based information boot process achieved holding depending operating system boot basic command line text based version operating system facilitate maintenance recovery action rom set require access technical functions interface boot process based boot process starts activation basic rom performs power self test test hardware essential passing test played control computer passed hardware necessary rom operation checks settings stored builds list devices device tree gathering stored information completion task takes process keyboard display claiming memory purposes checking key combinations pressed process completed displays grey apple logo spins spinning wait proceeds load extensions start
BootX (Apple)