•ROMis another type of memory permanentlystored inside the computer. ROM is non-volatile. It holds the programs and data when the computer is powered off.
•Programs in ROM have been pre-recorded. It can only be stored by the manufacturer; once it is done, it cannot be changed.
•Many complex functions such as start up operating instructions, translators for high level languages and operating systems are placed in memory.
•All the contents be in ROM can be access and read but cannot be changed.