GCSE Computing - RAM & ROM
- Created by: MrSwalbert
- Created on: 22-12-17 12:50
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- RAM & ROM
- Random Access Memory
- RAM is memory, not storage.
- RAM exists because it can sometimes take a long time for computers to retrieve instructions from the storage so they are all placed in the RAM.
- Memory can be thought of as billions of pigeon holes, or storage locations.
- Each holds one byte of data and has a memory address.
- It is said to be random because data can be accessed in any order.
- RAM is volatile. If power is lost, all the data currently in the RAM is also lost.
- Virtual Memory
- If there is not enough RAM to hold the whole of a large program, virtual memory is created. This is where part of the SSD or HDD is configured to be like the main memory.
- ROM
- ROM is not volatile and therefore does not lose its data.
- Bootstrap Loader
- This is a program in the ROM which loads up the OS when it is turned on.
- ROM is read-only and you cannot overwrite the contents of it once it has been created.
- Flash Memory
- This is a newly developed type of technology .
- Random Access Memory
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