Types of operating systems

The right OS for the job

Operating systems are designed for the device and the work it does. Your book describes four types.

A Real-Time OS (RTOS) must respond within a strict time limit called a deadline. It is used where a tiny delay could cause failure or serious harm: air traffic control, heart-monitoring devices and industrial robots. It processes tasks as soon as they arrive.

An Embedded OS is small and efficient, built into one device for one task or a few. It uses very little memory and power and is often stored permanently inside the device: microwaves, washing machines, printers, smart TVs and ATMs.

A Network OS manages many computers joined by a network and shares files, printers and internet connections. It focuses on communication between computers, in offices, schools and data centres. In a school lab, every computer saves to one server and prints on one printer.

A Mobile OS runs smartphones, tablets and smartwatches. It is built for touch screens, battery saving and apps, and supports wireless connections, cameras, sensors and app stores. Early Symbian phones ran a few small apps; Android and iOS handle millions.

Deadline matters → RTOS. One fixed job inside a device → embedded. Many computers sharing → network. Touch, battery, apps → mobile.

Key terms

RTOS

Responding within a strict deadline.

Embedded OS

Controlling only the functions one device needs.

Network OS

Sharing files, printers and internet among networked computers.

Mobile OS

Touch use, battery saving, apps, wireless, cameras and sensors.

Short questions with model answers

1. Q1. Which OS type suits an industrial robot on a factory line, and why?

   • Check the deadline.
   • Match the type.

   A Real-Time OS, because it must act within a strict deadline where even a tiny delay is dangerous.

2. Q2. How is an embedded OS in a washing machine different from a mobile OS in a phone?

   • Embedded.
   • Mobile.

   The embedded OS does one small job with little memory; the mobile OS is general enough to run millions of different apps.

Common mistakes

• ✗ Thinking real-time just means a fast computer.

  ✓ Real-time means responding within a strict deadline, where a delay could cause failure.

• ✗ Putting an ATM under network OS because it connects to a bank.

  ✓ Your book lists ATMs under embedded OS: a built-in OS for one device's job.

• ✗ Leaving smartwatches out of mobile OS because they are not phones.

  ✓ Your book lists smartphones, tablets and smartwatches as mobile OS devices.

MCQs

1. 1. Which OS type is used in air traffic control?

   1. (a) Mobile OS
   2. (b) Embedded OS
   3. (c) Network OS
   4. (d) Real-Time OS
   Show answer

   (d) 1.8.1, p. 14.

2. 2. A microwave's OS uses very little memory and power and is stored permanently inside it. It is:

   1. (a) An embedded OS
   2. (b) A network OS
   3. (c) A mobile OS
   4. (d) A shell
   Show answer

   (a) 1.8.2, p. 15.

3. 3. All computers in a school lab save files to one server. Which OS makes this possible?

   1. (a) Real-Time OS
   2. (b) Embedded OS
   3. (c) Network OS
   4. (d) Mobile OS
   Show answer

   (c) 1.8.3 example, p. 15.

4. 4. Which feature is the key feature of a mobile OS in your book?

   1. (a) A strict deadline for every task
   2. (b) Wireless connectivity, cameras, sensors and app stores
   3. (c) One fixed task only
   4. (d) Sharing one printer between offices
   Show answer

   (b) 1.8.4, p. 15.

5. 5. Which early mobile OS does your book say could run only a few small apps?

   1. (a) Android
   2. (b) iOS
   3. (c) Symbian
   4. (d) Linux
   Show answer

   (c) Do You Know, p. 15.

Quick revision

• A Real-Time OS meets strict deadlines, for air traffic control, heart monitors and industrial robots.
• An embedded OS is small, built into one device for one job, like a microwave or ATM.
• A network OS shares files, printers and internet between computers; a mobile OS runs phones, tablets and smartwatches.