CompTIA® A+ Practical Certification Exam Cram Notes

2. Other Operating Systems & Technologies

2.4 Basic features of mobile operating systems

1. Advanced Configuration and Power Interface (ACPI): specification provides an open standard for device configuration and power management by the operating system.

2. Operating System Power Management (OSPM): is an operating system technology for managing the power of the underlying platform and switching it between different power states. OSPM enables a platform or system to implement the most efficient power mode and is applicable across all devices and components within a platform/system. OSPM is also known as Operating System-directed configuration and Power Management.

3. The Advanced Host Controller Interface (AHCI): is a technical standard defined by Intel that specifies the operation of Serial ATA (SATA) host bus adapters in a non-implementation-specific manner

4. iCloud : is a cloud storage and cloud computing service available on iPhones and other compatible computing devices. The service allows users to store data such as music and iOS applications on remote computer servers for download to multiple devices such as iOS-based devices running iOS 5 or later, and personal computers running OS X 10.7.2 "Lion" or later, or Microsoft Windows (Windows Vista service pack 2 or later).

5. The Global Positioning System (GPS) : is a space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. Most smart phones have GPS built into the software.

6. Accelerometer: Accelerometer measures acceleration (change of velocity) in a given direction. Mobile devices use accelerometer for screen orientation.

Every modern Smartphone can change the orientation of the display based on the phone's rotation with the help of accelerometer.

Traditional accelerometers use a "seismic mass" attached to a spring encased in some sort of housing. As the device moves the mass moves on the spring and the device can measure the movement. Using multiple units a device can determine which way it turned based on which masses move.

7. Gyroscope: A gyroscope is a device with a spinning disc or wheel mechanism that harnesses the principle of conservation of angular momentum: the tendency for the spin of a system to remain constant unless subjected to external torque. Gyroscope enables re-alignment of screen orientation as the user turns his phone.

8. iOS, Android OS, Windows Mobile : Google's Android, Apple's iOS, Windows Mobile are three of the most widely used operating systems in mobile devices, such as smart phones and tablets. Android, which is Linux-based and partly open source, is more PC-like than iOS, in that its interface and basic features are generally more customizable from top to bottom. However, iOS' uniform design elements are sometimes seen as being more user-friendly.

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