Page 83 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

Some of the popular mobile operating systems are:

• Android
• iOS
• Symbian
• Windows Mobile

• Linux Android OS
Android is an operating system for mobile devices that is developed by Google. Android operating systems
are based on the Linux kernel and the GNU software. Android has a large community of developers writing
applications that has helped to extend the functionality of the devices. The developers write managed code
in Java, controlling the device via Google-developed Java libraries. Android is a mobile operating system that
has an open-source framework and is based on Linux which helps us to develop advanced and user-friendly
applications. It follows a Monolithic kernel approach.
iOS

iOS is an operating machine based on the UNIX environment constructed for Apple’s iPhone, iPod touch and
iPad of different cell devices. The iOS architecture is layered. It follows a hybrid kernel approach. It contains
an intermediate layer between the applications and the hardware so they do not communicate directly. The
lower layers in iOS provide the basic services and the higher layers provide the user interface and sophisticated
graphics. iOS is also used to manage the hardware of a gadget and for supplying applied sciences required to
enhance each and every application and internet applications also. iOS used to be first introduced and launched
as the operating system gadget of the iPhone introduce on the twenty-ninth of June, in the year 2007. The iOS
has also consisted of apps like phone, messaging, core services of CF network, security services as keychain and
certificate and trust services and core os.
Symbian
Symbian operating system is the most popular operating system used in most Smartphones and mobile phones
today. The heritage of Symbian OS begins with some of the first handheld devices. This operating system began
its existence in 1988 as SIBO (an acronym for ’16-bit organizer’). SIBO ran on computers developed by Psion
Computers, which developed operating system to run on small footprint devices. It was designed with specific
criteria that can be characterized by event-driven communications, using client-server relationships and stack-
based configurations. Symbian OS model follows layered approach and contains UI frame work layer, Application
services layer,
Windows Mobile

Windows Mobile is an operating system used in various mobile phones and Smart phones. It encompasses the
entire software stack from the kernel to the application interface. This operating system is compatible with the
Microsoft Office suite of programs. The current version is called “Windows Mobile 6.5”. It is based on the Windows
CE 5.2 kernel. Additionally, third-party software development is available for Windows Mobile, and the software
can be purchased via the Windows Marketplace for Mobile. Originally appearing as the Pocket PC 2000 operating
system, most Windows Mobile devices come with a stylus pen, which is used to enter commands by tapping it
on the screen.

Linux
Linux is unique among the other operating systems. This is because its development is driven by a community of
developers rather than by a single company such as Symbian operating system in Nokia phones and blackberry
OS in blackberry phones. According to ARCchart, the Linux operating system supports more processors than
other operating system, though the most popular phone models still use the Symbian operating system. However,
Linux is an open source operating system, where in, the developers constantly change and update it even at the
kernel level platforms.

Smartphones based on the open source Linux operating system have emerged in the market. There are many
advantages to using an open-source operating system like Linux. No cost and the opportunity to tap into the Linux
open source community are appealing. This has made Linux grow, not only for the server and PC market space,
but also in the embedded device area including handheld computers. For example, Motorola that is a notable
supporter of Linux has released the A760 Smartphone based on this operating system.

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CITS : E & H - Electronics Mechanic - Exercise 136