The first computer Operating System was CP/M. CP/M was created by a programmer called Gary Kindall in 1976 and laid the blueprint for popular OS's like DOS and Windows.
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The first Android powered device came onto the market on 22nd October 2008.
After Mac OS. Mac OS was based on the earlier Xerox Alto system.
Apple Inc. owns, writes, publishes, and distributes Mac OS X 10.6 "Snow Leopard" (the current version of Mac OS X, as of January 2010), along with every prior version of Mac OS since its introduction in 1984.
It's "iOS" exactly. Apple is popular for naming their devices and/or products with a lower case "i" and giving standard names to it like iPad, iPod, iPhone. OS is widely known as an abbreviation to Operating System. iOS which was first iPhone OS could mean iOperating System, but its just iOS.
first in first out
Mac OS is the first operating system developed in the year 1955
Mac OS Leopard
the first OS was made by Microsoft called MS-DOS, released in July of 1981.
XP
windows 95.
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The first Palm OS handheld that was introduced with a color screen is the Palm IIIc. This Palm OS version was the first to have native color support and support paletted 8-bit colour modes.
os
DOS
sir Bill grades