L4 Slides – Computer Systems – KS4

A location to store attendance

A small fast access memory location

A location to store status quickly

A place to store programs

A clock records the number of cycles

A clock times how long a processor has been running

A clock synchronises the cycles per second

A location to store attendance

A small, fast access memory location

A location to store status quickly

The ALU carries out logical and mathematical operations

The ALU helps to save to memory

The ALU controls the bus system

Arithmetic logic unit

Arithmetic link unit

Algorithm logic unit

Read-Only Memory

Read-Only Module

RAM - Read only, ROM - Read and write

RAM - Read and write, ROM - Read only

RAM - Stores permanent instructions, ROM - Stores instructions for CPU

RAM - Non-volatile, ROM - Volatile

RAM stores permanent instructions for booting up the computer.

RAM is read only.

RAM stores instructions and data ready for a CPU to execute.

RAM is non-volatile.

Volatile memory loses data when power is off.

Non-volatile memory keeps data when power is off.

RAM is non-volatile memory.

ROM is volatile memory.

RAM is volatile, ROM is non-volatile

RAM is non-volatile, ROM is volatile

Both RAM and ROM are volatile

Both RAM and ROM are non-volatile

RAM

ROM

Cache

Flash

It acts as an extension of main memory

It replaces the main memory

It stores only the operating system

It increases the speed of the CPU

To store all data permanently

To improve performance by saving frequently used instructions and data

To connect the CPU to external devices

To increase the size of RAM

Cache stores frequently used instructions and data.

L3 cache is faster than RAM.

L1 cache is the slowest cache.

Cache is not important for CPU performance.

L1 cache is the largest but slowest.

L2 cache is usually part of the RAM.

L3 cache is slower than RAM.

L1 cache is the fastest but can store the least.