Computer components Skills none IT concepts computer components

Computer components Skills: none IT concepts: computer components (input devices, output devices, memory, storage and CPU), network application vs. stand-alone application, information flow, operating system, application program, program file vs. data file, embedded system, general purpose computer, RAM, ROM, hardware cost trend This work is licensed under a Creative Commons Attribution-Noncommercial. Share Alike 3. 0 License.

Where does this topic fit? • Internet concepts – Applications – Technology – Implications • Internet skills – Application development – Content creation

Computer components CPU Input devices Memory Storage devices Output Devices

Input devices

Output devices

Storage devices

CPU and memory

Let’s trace the information flow in a word processing, a stand-alone application.

Power is off Store both data and program files Operating system WP Prog DB Prog SS Prog Store both the OS and application programs

Power on – copy OS to memory (bootstrap) Operating system WP Prog DB Prog SS Prog

OS displays the login screen Keyboard Display Operating system WP Prog DB Prog SS Prog

After login, OS displays the desktop Display Operating system WP Prog DB Prog SS Prog

What happens when we write, print and save a word processing document?

Copy word processing program into memory Display Mouse 1 Operating system WP Prog 2 Operating system WP Prog DB Prog SS Prog

WP program displays a blank document Display Operating system WP Prog DB Prog SS Prog

Enter and display the document Keyboard Mouse Display Operating system WP Prog Both programs and data WP Doc Operating system WP Prog DB Prog SS Prog

Print the document Printer Mouse Operating system WP Prog WP Doc Operating system WP Prog DB Prog SS Prog

Save the document Display Mouse Operating system WP Prog WP Doc Operating system WP Prog DB Prog SS Prog WP Doc

Turn power off Operating system WP Prog DB Prog SS Prog WP Doc

Things with computers inside (embedded)

General purpose computer Programs in volatile, random access memory (RAM) Special purpose computer Programs in fixed, read only memory (ROM)

A few questions

Where does the Internet fit in our system diagram?

The Internet is Input and Output device

What is the input device on the i. Pad tablet computer? What other input and output devices would you like to see on a tablet computer? Is the storage capacity of your computer greater or less than the memory capacity? What is the cost trend for memory, storage and CPU chips? Why would you want more memory on your next computer? Why would you want more storage on your next computer?

Computer components Skills: none IT concepts: computer components (input devices, output devices, memory, storage and CPU), network application vs. stand-alone application, information flow, operating system, application program, program file vs. data file, embedded system, general purpose computer, RAM, ROM, hardware cost trend This work is licensed under a Creative Commons Attribution-Noncommercial. Share Alike 3. 0 License.

Connectivity speed in context CPU 8 GB/s Internet download 4 Mb/s Memory 30 plus MB/s Storage device 1 Mb/s Internet upload

ATTO disk benchmark: SSD speed increase SSD, Win 7 laptop HD, Win Vista laptop HD, Win XP desktop