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Paper 2 - Computer Science > Internal hardware components > Flashcards

Flashcards in Internal hardware components Deck (13)
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1

What is a backing store?

Normally a hard disk, which retains the data written on to it after the computer system has been switched off.
- could also be flash memory or removable disks

2

What are input devices?

A form of inputting data into a computer. Typically a mouse, keyboard and microphone

3

What are output devices?

System output can be printed out by the user or displayed on a computer system

4

What is a power supply?

Used to convert alternating current into low-voltage direct current to supply power to the internal components of the computer system

5

What are some typical activities of the processor?

- Sorting and searching data
- Logical decision making
- Performing Calculations
- Control of input, output and storage devices.

6

What is main memory?

Stores program instructions and data that are processed by the processor

7

What is the system bus?

The system bus is composed of the address, control and data bus

8

What is the address bus?

A wire in the cpu that specifies a memory address in main memory

9

Define control bus?

- Bidirectional bus that transmits command, timing and specific status information between system components

10

What does addressable memory mean ?

Each memory location in main memory has a unique numeric code.

11

What are the steps to select a memory location?

- The processor writes the address into the address bus
- The processor sends a request to the control bus with instruction to read/write to the memory location
- The data that is being read from/written to will be transferred via the data bus

12

What does the data bus do?

A bidirectional bus that moves data/instructions between components

13

what is the maximum number of addressables cells for n address lines

2^n
for examples 3 address lines gives a maximum of 8 addressable cells