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ROM memory typically contains code which is essentially read during the start, operation and shutdown of a system, containing vital information about system components and their architecture as well as information and instructions on how they communicate with each other.

To protect code which is vital for the correct functioning of a hardware system, data is being "hard coded" into the memory module (therefore "Read Only") thus preventing accidential damage to the code which would have a negative impact on performance or even render the whole system unusable.

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