A type of small, high-speed memory inside the CPU.

What is Cache used for?

is used to store data that is frequently accessed

What are two functions of the CU

the CU handles the LOADING of new commands into the CPU and the DECODING of these commands, it also directs the data flow and the operation of the ALU

What is the need for persistent storage?

Persistance storage is needed when the system is powered off.

Functions of an operating system

Provides a user interface, Does memory management, Does peripheral management, Allows multi-tasking, Provides security

What is User interface?

Has to provide a link between the user and the computer hardware.

Types of User Interface

Graphical User Interfaces (GUIs) that have menus and icons, Command Line Interfaces (CLIs) where the user types in codes, Natural Language Interface (NLIs) where the user speaks to the interface, Menu Based Interface (MBIs) which gives the user a selection of options.

is done by keeping track of storage devices (like HDD) and controlling which application has access to which area of memory (RAM). Each location in memory can be read, modified, and written to by the OS. When the memory location is full the OS sends a confirmation message. Similarly, the OS provides file management services by sorting out where data is stored on the disk drives and memory.

Peripheral management

Keyboard, mouse, monitor and printers are controlled through device drivers. A device driver is a software program which allows hardware devices to be used by the OS. They act as translators between the devices and the computer system.

The OS coordinates the working of different programs by allocating the CPU time between different programs based on time and priority of the software application. Each task running is given a slice of time, or a turn on the CPU. Each task has to wait its turn unless it is given a higher priority by the OS in which case it gets more or longer time slices.

•OS prevents unauthorised access. • It ensures security of the system through usernames and passwords. • The OS protects files from other users reading or writing files.

Passwords, Firewalls, Antivirus, etc.

Computers use binary - the digits 0 and 1 - to store data. A binary digit, or bit, is the smallest unit of data in computing. It is represented by a 0 or a 1.

Bits can be grouped together to make them easier to work with. A group of 8 bits is called a byte.

IB Computer Science Unit 2 Test

Quiz

•

Computers

•

12th Grade

•

Practice Problem

•

Hard

Adama Boiro

Used 4+ times

FREE Resource

27 questions

Show all answers

1.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Takes in Binary #'s and makes logic(AND, OR) and arithmetic(+/-) calculations

2.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Stores the memory address of the Instruction

3.

FILL IN THE BLANK QUESTION

1 min • 1 pt

What is the Fetch-Execute cycle

4.

FILL IN THE BLANK QUESTION

1 min • 1 pt

First phase of the CPU's operation, this is where instructions are fetched

5.

FILL IN THE BLANK QUESTION

1 min • 1 pt

2nd Stage of a CPU's operation, this is where instructions are understood in order to perform it

6.

FILL IN THE BLANK QUESTION

1 min • 1 pt

3rd stage of a CPU's operation, this is where the instruction is performed

7.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Short term memory, Voloataire, used to store working data

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IB Computer Science Unit 2 Test

27 questions

Takes in Binary #'s and makes logic(AND, OR) and arithmetic(+/-) calculations

Stores the memory address of the Instruction

What is the Fetch-Execute cycle

First phase of the CPU's operation, this is where instructions are fetched

2nd Stage of a CPU's operation, this is where instructions are understood in order to perform it

3rd stage of a CPU's operation, this is where the instruction is performed

Short term memory, Voloataire, used to store working data

Stores instructions permanently for your computer, non-volatile

What is Cache

What is Cache used for?

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