Summary
Full OCR computing course summary
- Module
- Full course
- Institution
- OCR
OCR a level computer science summary to achieve grades A*-B. All handwritten and summarised from the textbook
[Show more]
Seller
Follow
Content preview
Fetch decode executecompiler hastodo more workto compiler has less w
Address from the PC is copiedintothe MAR translate highlevel to machine code high level rode into mac
bus tomainmemorywhere it waitsfor
1 a
pen
Iff More RAM is required
code
to store the Less RAM is required sin
instruc
Controlunitsends read signal on controlbus to main
memory Manyspecialised
Contents
can now be senton databus to thememorydataregister Pipelining is possible since each even though only a fe
MDRcopies into CIR instruction takes one clock gate used
DC gets incremented
processor whichhaslots of independent working in parallel
iii ii s.it i
Multi core CPUshave multiple independent
cores thatcan complete
instructions separately which results in higher performance
nd addressto the MAR
sendaddress down addressbus to main Parallel accomplish a similar task as
memory they use threading
CU readsthe read signalalongcontrol bus In larger projects multicore performbetter
Contents stored at address canbesent
alongdatabustoMDR
MDRcopied into ACC
instruction is complete
RAM fast volatile temporystorage optical devices are read from andwr
cannotbe modified bootstrap BTaginformation is
ROM represented
by
nonvolatile reflect or scatter the light
virtual storage storinginformation remotely Pits 0
lands
CDs DVDs Blu
each
so can beaccessed
computer
byany
is highcost
elining process of completing the fde cycle of 3
formation
separate instructions simultaneously magnetically represent
polarisedand unpolarised
, 2 Interrupt Service routine
collection of thatwork together
perating system programs
checks the content of the interrupt register atthe end of
to provide an interface between the user
each fde cycle
and computer
current contents of the special purpose
registers in the
OS provides the followingfeatures
CPO are temporarily transferedinto a stack
memory management
loads appropriate ISR into RAM
resource management
file management
Scheduling
input output management
Software
utility Jobs receive a fair amount of processingtime
security
1 preemptive
UI
Jobs are activelymade to start stopbytheOS
MLFQ SRT RR
Ty ages
is split up into equal size sections known as
2 non preemptive
once a job is started it is left fill it is completed
ÉI
FCFS SSF
upof memoryinto logical sizeddivisions known as
segments
typesofos to
low the structure and logical flow of the program
Distributed run across multiple devices
memoy
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller joshmarlow100. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £5.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
52510 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now