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Theory
Ch 1- System Technolgies
1.2.
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Cards (16)
*HARDWARE OVERVIEW*
Hardware usually consists of
input
,
output
,
storage
(HDD, SDD),
memory
(RAM, ROM),
processing
(CPU,GPU),
communication
(modem, NIC)
*INPUT AND OUTPUT DEVICES*
Input
Example: microphone, scanner, camera, mouse, keyboard
*INPUT AND OUTPUT DEVICES*
Both
Example: phone
*INPUT AND OUTPUT DEVICES*
Output
Examples: laptop screen, speaker, projector, printer
*MAIN COMPONENTS*
Computers consist of
hardware
and
software.
1
wont
function without the other
*STORAGE, MEMORY AND COMMUNICATION*
Storage
Allows you to
store
data
for later use
Examples:
Hard
disk
drives
(HDD) and
solid
state
drives
(SSD)
*STORAGE, MEMORY AND COMMUNICATION*
Memory
Examples:
Random
access
memory
(RAM) and
Read
only
memory
(ROM)
*STORAGE, MEMORY AND COMMUNICATION*
Communication
Transmits
analogue
/
digital
signal over
wired
/
wireless
network
Examples:
modem
,
router
and
network interface card
(NIC)
*PROCESSING*
Central processing unit
(CPU)
Processes
general instructions
,
fetches
,
decodes
and
executes
each instruction 1 at a time
*PROCESSING*
Graphics processing unit
(GPU)
Processes
instructions
that
create pictures
on your
screen
,
3D
games rely heavily on GPUs
*SOFTWARE OVERVIEW*
System software
Provides the
services
the
computer
requires, enables the computer or device to
work
or helps to maintain the
good working order
of the computer
*SOFTWARE OVERVIEW*
Application software
Provides
services
that the
user
requires
Examples:
word processor
,
media player
,
social media
*SOFTWARE LICENCING*
Shareware
Free
trial
period
/
limited
functionality
before
paying
Example:
adobe acrobat reader
*SOFTWARE LICENCING*
Freeware
Free
of charge
Example:
google chrome
*SOFTWARE LICENCING*
Free Open Source Software
Source code available for use modification+
distribution
Examples:
LibreOffice
and
Linux
kernel
*SOFTWARE LICENCING*
Proprietary software
Source code not available
costs money
Example:
Microsoft office