OCR GCSE Computer Science 1.1 Systems architecture overview quiz quiz

Decode, fetch, execute

Execute, decode, fetch

Fetch, execute, decode

Fetch, decode, execute

The arithmetic logic unit

The control unit that decodes the instructions

The cache that stores frequently used data

The Program Counter holding the next address

The Memory Address Register (MAR)

The Program Counter (PC)

The Memory Data Register (MDR)

The Accumulator (ACC)

The memory address of the next instruction to be fetched

The result of the most recent calculation done by the ALU

The data or instruction in transit to or from memory

The control signals sent out to coordinate the rest of the CPU

Instructions and data are stored in two completely separate memories

There is no main memory at all, only the registers inside the CPU

The CPU has no control unit and decodes nothing before executing

Instructions and data are stored together in the same memory

A higher clock speed

A larger hard disk

More secondary storage

A larger monitor

Cores can never run at the same time as one another inside a CPU

Some programs are sequential and cannot be split across cores

Adding more cores always forces the CPU to use a slower clock speed

Cores are not able to access the cache, so they keep waiting for RAM

When the cache runs out of space and has to overwrite old data

When the CPU clears the whole of the cache to start again

When the data the CPU needs is found in the cache

When data is written from the cache back to the slow hard disk

A desktop PC running many different programs at once

A laptop with a range of software installed on it

A tablet that the user can install their own apps on

The controller inside a washing machine

Dedicated to one task, small, cheap and low-power

Large, expensive and high-power, built to run heavy software

Runs many user-installed programs chosen by the owner

Has a full operating system that the user manages themselves

To perform the arithmetic and logical calculations

To decode instructions and send control signals

To store frequently used data close to the processor

To hold the result of the most recent calculation done

It directly increases the clock speed of the processor in hertz

It adds more processing cores for the CPU to share the work out across them

More frequently used data is found in cache, so the CPU waits less for RAM

It makes the hard disk read and write data much more quickly