Question

Three differences in RAM and ROM

Answer 1

Explanation:

Definition:

• RAM stands for Random Access Memory.
• ROM stands for Read Only Memory.

Data Retention:

• RAM data is volatile. Data is present till power supply is present.
• ROM data is permanent. Data remains even after power supply is not present.

Data Access :

• RAM data can be read, erased or modified.
• ROM data is readonly.

Usage :

• RAM is used to store data that CPU needs for current instruction processing.
• ROM is used to store data that in needed to bootstrap the computer.

Speed:

• RAM speed is quite high.
• ROM speed is slower than RAM.

CPU Access:

• CPU can access data stored on RAM.
• Data to be copied from ROM to RAM so that CPU can access its data.

Capacity:

• RAM memory is large and high capacity.
• ROM is generally small and of low capacity.

Usage:

• RAM is used as CPU Cache, Primary Memory.
• ROM is used as firmware by microcontrollers.

Cost:

• RAM is costly.
• ROM is cheap.