Summary
Summary IT Theory Grade 12 IEB Summaries
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Summaries for Grade 12 IEB IT theory according to the SAGS
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LUZ : Hardware and SoftwareModular
Design Comp :
be
put . can
together / upgraded with
your requirements
in mind
↳ Components
to Advantages
easily interchangeable .
: -
Repairs are easier
Upgrades easier
-
are
-
Flexibility
Improving Processor Speed :
↳ Reloads instructions
Hyper threading Duplicating :
on -
chip registers . on
registers .
Multiprocessing :
Multiple cores on CPU chip .
Many instructions processed ab same time (parallel
processing)
Processor Cache :
Cache pre
-
fetches instructions and data from RAM .
Can serve faster to CPU
Size
Register :
Store current instructions and it's data .
Larger Register =
more data
processed at one time .
Bus Size :
Daba Bus size should match .
register size ( 32 bit -
or 64 bit )
-
larger Bus =
more
memory to
be addressed .
Overclocking / :
Overclocking Making components run at speeds faster than
designed
-
Clock multiplication to Per component
:
Changes own clock multiplication factor
whole system
:
system clock increased
Expansion Cards us .
Onboard Controllers
↳ Onboard controller -
_
Cannot be removed or
replaced .
Uses system resources
Expansion Card :
Connect Go motherboard slob .
Provides better
functionality
,Co Processors
- :
Assistant to CPU
↳ Graphics Card Co-processor
:
that handles
graphics rendering ,
freeing up CPU .
to 4 main
components : Motherboard connection for data t
power
Processor
Memory
Monitor Connection
Integrated Graphics : On chip CPU -
processor
for
graphics .
↳
Advantages Cheaper :
Less heat t
power usage
.
Maths Co-processor Helps ALU calculations Embedded CPU
process complex in
:
.
.
Increasing speed + Size of RAM
↳ URAM :
Memory housed on slower
secondary storage
↳
Increasing RAM = less need for slow URAM =
increase in
speed .
Buses
to Internal Buses
local
Internal buses ( address control bus ) located motherboard
memory
: on
, ,
Size of bus influences speed of
processing .
Size of bus data / locations
carry memory
=
more .
External Buses :
Connects external devices to computer
SATA USB NUME
eg ,
.
,
Ports
to USB :
Note the difference between
to USB Standards USB : 3.1 , 3.0 and 2.0 indicate speed .
USB Ports USB Type :
-
A, B or C indicate
port shape .
↳ Type -
A -
_
Most common USB port .
Device w/ port provides electricity + controls data
Type -
B :
Square-shaped .
Used for portable devices
Type -
C :
Reversible
Allows bi-directional power CUSB Power Delivery )
, HDMI and DisplayPort
↳ Carry Definition quality digital
High video and audio .
to DP supports When displays all connected instead of the
chaining eachother
:
to
daisy are source
Thunderbolt Parts
↓ The faster and allows daisy
same as USB C but
chaining
-
,
↓ Not all USB-C ports support Thunderbolt
Secondary Storage
to SSD : Solid State Drive
to Consume
Advantages less
power
:
Less prone to data loss
Faster Read / Write speeds
M .
2 :
SSD Ghab connebs to M 2 slot
. on motherboard
M 2 refers
.
to form factor
same SATA SSD
speed as
NU Me M 2 .
: SSD connects via PCI express
-
Faster Read /Write speed than SATA SSD
Typical Computer Systems
to Entry level
laptop / desktop
Mid-level laptop / desktop
High -
level laptop / desktop
Server
Wearable Tech
Technology :
worn near or on skin .
Used to analyse info
[
detect , and transmit about user .
Smartwatches :
Connect to user
smartphone and
notify user
smart Tech
clothing
:
enhanced clothes that add extra
functionality
Head Mounted Headset
-
Display : with small
display per eye
to AR :
Augmented Reality overlay -
over real-world
VR :
Virtual Reality Complete virtual
-
experience
Implanted Smart Device :
Surgically implanted devices
Mobile Constraints
Technology
↳ Screen size
,
Single window ,
Computing power
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