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Computer memory is the part of the system used to store data and programmes, either permanently or temporarily. There are two main types: immediate access memory and backing storage. The memory volume is measured in bytes, or kilobytes which are units of 1,024 bytes, or megabytes which contain 1,024 kilobytes.
Immediate access memory or internal memory describes memory locations which can be accessed readily by the central processing unit. It is either read only which is stored in ROM, PROM or EPROM chips, or read/write which is stored in RAM chips.
Read only memory is data that needs to be constantly available and is unlikely to need changing. It is non volatile ie. it is not lost when the computer is switched off. Read/write data is volatile and is lost when the computer is switched off.
Backing storage or external memory is non volatile memory held outside the central processing unit. It is used to store programmes and data that are not currently being used.
Immediate access memory or internal memory describes memory locations which can be accessed readily by the central processing unit. It is either read only which is stored in ROM, PROM or EPROM chips, or read/write which is stored in RAM chips.
Read only memory is data that needs to be constantly available and is unlikely to need changing. It is non volatile ie. it is not lost when the computer is switched off. Read/write data is volatile and is lost when the computer is switched off.
Backing storage or external memory is non volatile memory held outside the central processing unit. It is used to store programmes and data that are not currently being used.
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