Computer Science
Give 4 functions of the OS
- User Interface
- Memory management
- File management
- Security
- Interrupt handling
- Processor scheduling
What does the OS do
Hides the complexity of the hardware from the user by providing a user interface
What are pages?
Avavilable memory which is physically divided into fixed size chunks
Why is memory management important
- It allows programs to share/allocate memory to each other
- It allows programs larger than RAM to run
- Organises RAM use by converting logical addresses to physical addresses
Give 3 features of paging
- Memory is physically divided into fixed size chunks
- Each page has an address
- Used for virtual memory
Define 'Segmentation'
Where memory is logically divided into segments which acn be different lengths
Give 3 features of segments
- They're logical divisions
- They're complete sections of programs
- They're different sizes
Give 3 similarities of paging and segmentation
- Both allow programs to run even with insufficient memory
- Both are stored on a disk
- Both are transferred to memory when needed
What is virtual memory
Extra storage for when RAM is too full
What is disk thrashing?
Where pages are repeatedly swapped in & out of virtual memory causing the computer to slow down
What happens to sections of programs which aren't in use
They're temporarily moved into virtual memory by paging
What is an interrupt
A signal from an app/device to a processor indicating it needs attention
Give 3 examples of interrupts
- A printer running out of paper
- An error occurring in a program
- Power Failiure
At what point in the cycle does the CPU check for interrupts
At the end
Give 2 features of interrupts
- They're processed in the order of priority
- They can interrupt themselves if the new interrupt is of a higher priority
What does a distributed OS do
Coordinates the processing of a single job across multiple computers
Give an example of where a distributed OS can be used
In an online shopping site, where one server handles your basket whilst another handles querying of items
What is an embedded OS
An OS that provides limited specialist functionality
Give 2 examples of devices with embedded OS's
- Washing machine
- Traffic lights
- Air Fryer
- Tumble dryer
What is a real time OS
An OS designed to perform a task within a guaranteed time range
Give examples of devices that operate in real time
- Hospital monitoring machines
- Burglar Alarms
- Smoke detectors
- Aircraft autopilot systems
When are real time OS's usually used
In safety critical environments
What does BIOS do and what is it responsible for and where is it stored
- It boots up the computer
- Responsible for loading the OS when the computer switches on
- Stored in ROM
What's the first thing BIOS does
Checks if the hardware it needs is connected and working using a power on self test(POST)
What does the bootstrap (boot loader program do)
Loads the OS kernel into memory
Where are the BIOS settings stored and why?
Stored in flash memory so they can be changed and retained when switched off
What is a device driver
A software that tells te OS how to communicate with a device
What is a driver
A program that provides an interface for the OS to interact with the user
How do device drivers work
Translate OS instructions to print documents into a series of instructions that a specific piece of hardware will understand
Why are drivers important
To allow the OS to control hardware devices
What is a virtual machine
A program with the same functionality as a physical computer
What can a virtual machine be used for
Running an OS inside another to emulate different hardware
A virtual machine can execute intermediate code, give an example
java virtual machine, executes java byte code
What does a MAME virtual machine do
Emulates the hardware of old virtual machines so that their games can be played on modern machines
Describe the ISR routine
The processor checks for interrupts at the end of the FDE cycle. If there's an interrupt of a higher priority than the process being executed, the current contents in the special purpose registers are pushed into a stack.
| Quiz |
|---|
| Geo Unit 1 (Interrelationships, Pattersn + Trends, SEEP) |
| instuderingsfrågorna |
| module 3 study guide |
| UE7-l'image du coprs au fil du temps |
| battaille de la somme |
| rate of reaction |
| energy changes in reactions |
| Zone 4 Lecco |
| Zone 3 Lecco |
| Zone 2 Lecco |
| Zone 1 Lecco |
| sun |
| latn. 6 |
| ekonomi |
| work |
| chapter 25origin and diversification of eukaryotes |
| chapter 24early life and the diversification of prokaryotes |
| anatomy |
| chapter 23broad patterns of evolution |
| Finska 50 ord 1 |
| istalacion aire acondicionado |
| science |
| Bio Diversity Quiz - copy |
| Chemistry chp 1Names of significant discoveries and who discovered them |
| Bio Diversity QuizAnswer the following questions.g |
| MichaelaHistory unit one test memorization |
| Mesocorticolimbic System |
| key terms 12.2 |
| MOQ |
| berlin |
| plant id week 1plant ID flashcards |
| Ballet Terms |
| french mardu gras |
| CALCULATIONS |
| GIS |
| chapter 22speciation |
| les inégalités sesles inégalités |
| church historyidk |
| ses l'ecolechap sur l'école |
| Frans être & faire |
| provsjukvård |
| chapter 21evolution of populations |
| polish |
| vocab |
| Quiz 6 |
| Revenue Recognition IFRS 15 |
| géographie définitionsgéographie définitions G4 G5 |
| electricity and chemical change |
| Revision - Christian Teachings and Beliefs |
| hairlove |
| Gramatische Grundbegriffe |
| redox reactions |
| anat générale |
| Quiz 5 |
| embryo |
| bio cell |
| Latin Chapter 4 Vocab - copy - copy |
| Physical Geography: Case studies |
| Latin Chapter 4 Vocab |
| memory chaleng |
| dates histoiredates h3 a h6 histoire |
| histoiredéfinition h3 a h6 |
| Strategie H2 |
| duits schritt 12 tot schrit 16german |
| Judendomen |
| consonants |
| Survey of Philippine Literature |
| Medical Terminology |
| unit d - digestive system |
| russian Vocablery |
| Russian Vocab |
| Système digestif |
| devoir |
| chapter 20evidence for evolution |
| servir |
| partir |
| sentir |
| Sortir |
| using moles |
| Dormir |
| Pouvoir |
| vouloir |
| Midterm Practice Day 1I am choosing 6 questions per chapter of the testbank. |
| KINE1102- midterm lecture 7 |
| Quiz 4 |
| reacting masses and chemical equations |
| Système respiratoire |
| Quiz 3 |
| KINE1102- mideterm lecture 6 |
| Quiz 2 |
| Conceptual Underpinings |
| Strategie H1 |
| Quiz |
| chapter VI A Deductions |
| HaloalkanesCFC's |
| iil |
| Room Categories |
| Formes Taekwon-do |
| KINE1102- midterm lecture 5 |
| neymar |
| anatomi |
| KINE 1102- midterm lecture 4 |
| chapter 19darwin and his theories |
| spelling words |
| spelling words eli |
| Metabolism |
| KINE1102- midterm lecture 3 |
| biologie: planten |
| 6003 OS & Appl Security Week 7 Service Security Conceptsexam Practice |
| adjectives - JPN |
| Blood quiz - copy |
| Español Examen |
| Literary Terms C |
| tj judet onsdag |
| maths revison |
| Science-Biology |
| UE7-la vaccination toute une histoire |
| compounds mixtures and chemical change |
| introduction to elements |
| Presentation 1 |
| psychological explanations for offending behaviour |
| lärande och utveckling 3 |
| Imunoimuno |
| Blood quiz |
| Name the formulas |
| Set 5 Vocab |
| Nonfiction text features |
| 6003 OS & Appl Security week 7 Windows ServicesExam Study |
| 1.1 Nature of Economics |
| TKMB |
| sciencebb |
| Physical science quiz |
| chapter 1history if life, evolution, typological and population thinking |
| states of matter |
| no |
| KINE1102 midterm lecture 2 |
| Latin |
| WHF 2 |
| 4.8 (Frans naar Nederlands)Als ik spelfouten heb gemaakt, laat maar weten.
p.s. je hoeft er niet bij te zetten of woorden mannelijk of vrouwelijk zijn als er les, of l' staat. :) |
| KINE1102 midterm |
| home work |
| 4.6 (Frans naar Nederlands)Als ik spelfouten heb gemaakt, laat maar weten.
p.s. je hoeft er niet bij te zetten of woorden mannelijk of vrouwelijk zijn als er les, of l' staat. :) |
| öva mera på |
| 4.4 (Frans naar Nederlands)Als ik spelfouten heb gemaakt, laat maar weten.
p.s. je hoeft er niet bij te zetten of woorden mannelijk of vrouwelijk zijn als er les, of l' staat. :) |
| 4.2 (Frans naar Nederlands)Als ik spelfouten heb gemaakt, laat maar weten.
p.s. je hoeft er niet bij te zetten of woorden mannelijk of vrouwelijk zijn als er les, of l' staat. :) |
| nytt mag o tarm glosor test 4 |
| French and British Fur Trade: Chapter 4squiggle |
| social feb 22 |
| Computer Science1..4.2 |
| UE7-Paléoanthropologie: aux origines de l'Humanité |
| Franska prepositioner |
| 4.1 (Frans naar Nederlands)Als ik spelfouten heb gemaakt, laat maar weten.
p.s. je hoeft er niet bij te zetten of woorden mannelijk of vrouwelijk zijn als er les, of l' staat. :) |
| Computer Science1.4.1 |
| Cell Biology 25 (Manual flashcards) |
| Cell Biology 25 |
| Computer Science1.1.2 |
| Philo |
| Apah africa people-artworks |
| temptations |
| missouri laws |
| B1 |
| A321-200 |
| Katakana Combination QuizKatakana combinations sounds to practise |
| anouk |
| 4 kirja |
| french |
| science review A |
| W&S |
| Socio |
| Les vêtement Par Sylvia Duckworth |
| marketing |
| Vocab |
| TLE |
| Cognition 2 |
| Quiz - système lymphatique et immunitaire |
| Quiz au sujet du sang et le coeur |
| EXPH exam 2 |
| Elliot Sokoloski |
| espagnol |
| bb |
| Ali |
| Nk |
| gabby |
| history in gaza |
| history conflict in gaza |
| komparerade adjektiv |
| Chapter 12- The Heart |
| adjektiv B |
| adjektiv A |
| Chapter 4 health science |
| deklination 4 |
| grupp 15 nominativ singular till genitiv singular |
| deklination 3 grupp 15 |
| deklination 3 grupp 9 |
| deklination 3 grupp 8 |
| deklination 3 grupp 7 |
| deklination 3 grupp 4 |
| deklination 3 grupp 3 |
| deklination 3 grupp 1 |
| fortsättning deklaration 2 |
| deklination 2 |
| Macbeth quotes |
| deklination 1 |
| chapter 4+5 |
| Biologie lab 2 |
| Othello's character |
| Desdemona / Othello |
| Psychology Midterm |
| Biologie Lab 1 |
| Allotropes of CarbonAllotropes are different structural forms of the same element in 5he same physical stats. |
| Unit 2 Animal Diversity |
| unit d - macromolecules |
| Test 1 |
| révision France: une nouv place dans le monde |
| jannelle monae - turntables |
| fluently |
| provflflf |
| M.T. |
| Test your knowledge |
| CHAPTER 2: THE STRUCTURES OF GLOBALIZATION IN CONTEMPORARY WORLD |
| Molecules with Hydrogen (Memorize) - type answer |
| Molecules with Hydrogen (Memorize) |
| Au XVe et XVle siècle, les européens organisent plusieurs expéditions pour explo |
| INTRODUCTION QUIZ IN CONTEMPORARY WORLD |
| Knowledge Test NJ - Advanced |
| Anthro Quiz |
| Lab Equipment |
| Gut Brain Axis |
| Digestive System |
| glossary 2 |
| Spanish M2- travel |
| history 6 |
| David |
| En la ciudad |
| mmpm |
| it mangaement 4-6 |
| Computational and Systems Neuroscience |
| actors |
| german 18 |
| A330-300 - copy |
| Dugga |
| Unit 6 del 2 |
| Rullmat Lus6 |
| 90 Day words |
| Spanish |
| m2 |
| Unit 6 del 1 |
| Spaans: beroepen |
| Psykologi |
| Rullmat Lus5 |
| RullMat Lus4 |
| RullMat Lus3 |
| The returned (french show) |
| RullMat Lus1 |
| ALLEMAND 3 |
| RullMat Lus2 |
| Aller |
| sat words |
| exercise |
| WC Hinduism test |
| Week 5- Skin Care 2: Electric & HF |
| First Aid - copy |
| The Founding Father'sGovernment |
| Pentecostalism in the USReligion |
| United States GovernorsGovernors |
| Week 4- Skin Care 2: Contagious Disorders, other disorders, Auto-immune Disorder |
| Wk 5 Skin Penetration |
| United States of America Road SystemsRoads |
| Railroad HistoryRailroad |
| Maryland Judicial SystemMaryland |
| Maryand GeographyMaryland |
| Maryland Zoning LawsZoning |
| Wk 3 Comedones, Disincrustation, Extractions |
| United States city populationState Government |
| State LegislaturesState |
| 13th Amendment casesLaw |
| Cases that Challenge US ConstitutionLaw |
| Employment LawEmployment Law |
| blodet |
| Church LawLaw |
| CitizenshipCitizenship |
| Week 3- Skin Care 2: intro to skin conditions |
| Constitutional AmendmentsUnited States Constitution |
| Local Government Typesnone |
| State Constitutionsnone |
| State Courtsstate |
| gas fundementals |
