DIGITAL TECHNOLOGY
20 Questions



Pair off with another student within your table.
Both of you are to think of your favorite in a
specific category
Students will ask up to 20 yes/no questions until
they are able to identify the other students favorite
 Categories
 Animal
 Food
 Place
to go
Communication

In order to be able to communicate most technology
utilizes binary code.
 Binary
code is a system in which consists of two choices
on/off, 1 and 0
 Our alphabet utilizes 26 letters but most electronics
only use the binary code.
 Video:
BrainPop
PROCESSOR
CONTROL
UNIT
ARITHMETIC
LOGIC UNIT (ALU)
Instructions
Data
Information
INPUT
DEVICES
Data
MEMORY
Instructions
Data
Information
STORAGE
DEVICES
Information
OUTPUT
DEVICES
INPUT
Any data or instructions entered into the
memory of a computer.
Input Devices:
 Keyboard
 Mouse
 Trackball
 Touchpad
 Pointing stick
 Touch Screen
PROCESSOR / CPU


Interprets and carries out the basic instructions
that operate a computer.
Control Unit:
Component of the processor that directs and coordinates most of the
operations in the computer.
Like a Traffic cop:
It interprets each instruction issued by a program and then initiates the
appropriate action to carry out the instruction
STORAGE

Holds data, instructions, and information for
future use.
Storage Medium: Is the physical material in which a
computer keeps data.






Floppy Disks
Zip Disks
CD’s
DVD’s
Memory Sticks
USB Flash Drives
OUTPUT
Is data that has been processed into a
useful form.
Output Devices:
Are hardware components that convey information to one or
more people.






Monitors
Printers
Speakers
Fax Machines / Modems
Projectors
Video Card
MEMORY

Components which store instructions waiting to be
executed by the processor
RAM – Random Access Memory
 Computer
gets turned on programs get loaded into RAM
from storage devices for use.

ROM – Read Only Memory
 Refers
to memory chips storing permanent data and
instructions

CMOS – Complementary metal-oxide semiconductor
 Retains
information even when the computer is turned off,
i.e. start-up
STEP 1: The control
unit fetches the math
problem's instructions
and data from
memory. (100 x 52)
MACHINE CYCLE
5200
Student enters math problem into
the memory of the computer
MEMORY
STEP 4: The results of the
math problem are stored in
memory. (5200)
STEP 2: The control unit decodes
the math problem’s instructions and
sends the instructions and data to
the ALU. (100 x 52)
ALU
CONTROL
PROCESSOR
ARITHMETIC
UNIT
LOGIC UNIT
STEP 3: The ALU performs \
executes calculations on the data.
(100 x 52 = 5200)
The Internet

What is the Internet?
 The
internet is the largest computer network in the
world, connecting millions of computers. A network is a
group of two or more computer systems linked together.
Difference

When most people think of the internet, the first thing
they think about is the World Wide Web. Nowadays,
the terms "internet" and "World Wide Web" are
often used interchangeably—but they're actually not
the same thing.
The internet is the physical network of computers all over
the world.
 The World Wide Web is a virtual network of web sites
connected by hyperlinks (or "links"). Web sites are stored
on servers on the internet, so the World Wide Web is a
part of the internet.

INTERNET AND WORLD
WIDE WEB
Which came first - Internet or WWW?
The Internet



Internet is a network of interconnected computers
that is now global
Internet born in 1969 - called ARPANET
1969 ARPANET was connection of computers at
UCLA, Stanford, UCSB, Univ. of Utah
Computers late 60s & 70s


No Personal Computers – all
large mainframe computers in
late 60s
Mid 1970s – initial personal
computers


Altair: Box with blinking lights
Late 1970s – Apple 2, first
usable PC
Internet - 1970s


1972 - Telnet developed as a way to connect to remote
computer
1972 – Email introduced
 1977
users
- U. Wisconsin has first “large” Email system - 100
Computers 1980s



1981 – IBM PC
1984 – Apple Macintosh
1986 – Modem becomes option on PCs
Internet - 1980s

1986 - NSFNET created
 NSFNET
in 1990, becomes backbone of modern
Internet when ARPANET is decommissioned
Computer 1990s



Windows 95 GUI made computing easier for PCbound masses
Windows 95 + Internet (AOL, others)  Huge
increase in number of home PCs
Computer on every desk in workplace
Internet 1990s

1991 - Tim Berners-Lee releases World Wide Web!
 TBL
is computer programmer at CERN, a physics lab in Europe
(new book Weaving the Web by TBL)

1993 - Mosaic (becomes Netscape) designed by graduate
students at University of Illinois
 first
point-and-click browser
 later developed into Netscape Navigator

These are the two most significant events in the formation of the WWW
Collapse of the Information Economy


Huge economic growth in late 1990s was due to
“prospecting” on up-and-coming Internet companies
Most were never profitable
 Amazon.com
posted its first Annual Profit (2003) since
going public in 1997!

Major Internet Backbone Providers are struggling
Difference between internet and
www.

When most people think of the internet, the first thing
they think about is the World Wide Web. Nowadays,
the terms "internet" and "World Wide Web" are
often used interchangeably—but they're actually not
the same thing.
The internet is the physical network of computers all over
the world.
 The World Wide Web is a virtual network of web sites
connected by hyperlinks (or "links"). Web sites are stored
on servers on the internet, so the World Wide Web is a
part of the internet.

Assignment:

Pg 193 problems 1-5