원문 : http://en.wikipedia.org/wiki/Embedded_operating_system
An embedded operating system is an operating system for embedded computer systems. These operating systems are designed to be very compact and efficient, forsaking many functions that non-embedded computer operating systems provide, and which may not be used by the specialized applications they run. They are frequently also real-time operating systems.
Examples of embedded operating systems could include the software used in Automated teller machines, Cash Registers, CCTV systems, jukeboxes and suchlike.
Real-time operating system(http://en.wikipedia.org/wiki/Real-time_operating_system)
http://en.wikipedia.org/wiki/Windows_XP_Embedded#Windows_XP_Embedded
Windows XP for Embedded Systems
Windows XP for Embedded Systems is an edition of Windows XP that contains the full feature set of Windows XP Professional, but has restrictions on licensing that require the resulting device to boot directly into the original equipment manufacturer's application.
As of April 2008, this edition is marketed as part of the "Windows Embedded Enterprise" brand, which includes both this release and its successor, Windows Vista for Embedded Systems.
Windows XP Embedded
Windows XP Embedded, commonly abbreviated "XPe", is a componentized version of the Professional edition of Windows XP. An original equipment manufacturer is free to choose only the components needed thereby reducing operating system footprint and also reducing attack area as compared with XP Professional. Unlike Windows CE, Microsoft's operating system for portable devices and consumer electronics, XP Embedded provides the full Windows API, and support for the full range of applications and device drivers written for Microsoft Windows. The system requirements state that XPe can run on devices with at least 32MB Compact Flash, 32MB RAM and a P-200 microprocessor. XPe was released on November 28, 2001. As of October 2008, the newest release is Windows XP Embedded Service Pack 3.
The devices targeted for XPe have included automatic teller machines, arcade games, slot machines, cash registers, industrial robotics, thin clients, set-top boxes, network attached storage (NAS), time clocks, navigation devices, etc.[28] Custom versions of the OS can be deployed onto anything but a full-fledged PC; even though XPe supports the same hardware that XP Professional supports (x86 architecture), licensing restrictions prevent it from being deployed on to standard PCs. However, Microsoft has made at least one exception to this rule. Some Dell notebooks contain an embedded XP installation as part of the MediaDirect 2.0 feature. It is worth noting that all such laptops also have a standard OEM install of Windows in addition to the XP embedded installation.
Microsoft has announced that Windows Embedded Standard 2009 will succeed XPe by the end of 2008. Windows Embedded Standard 2009 is derived from Windows XP Embedded since Microsoft does not yet have a componentized version of Windows Vista. [29] Windows Embedded Standard 2009 includes Silverlight, .NET Framework 3.5, Internet Explorer 7, Windows Media Player 11, RDP 6.1 and Network Access Protection. [30] Microsoft however is also developing a componentized version codenamed Windows Embedded ‘Quebec’, containing Windows Vista features such as Aero, SuperFetch, ReadyBoost, BitLocker Drive Encryption, Windows Firewall, Windows Defender, Address Space Layout Randomization. [31] It will be available in x86 and x64 versions and targeted for release in 2010. Reportedly, it will have a larger footprint (~ 300 MB) compared to 40 MB of XPe and will also require product activation.[31]
Windows Embedded for Point of Service
Windows Embedded for Point of Service is a specialization of Windows XP Embedded. It was released on May 25, 2005, and focuses on the point of sale device market, such as fuel pumps, self-checkout stations, automated teller machines and cash registers.[28] It is not available for purchase directly from Microsoft, but is instead licensed to original equipment manufacturers.[32]
