Saturday, 25 July 2015

write short notes on the following memory devices?

Random Access Memory (RAM)
A type of memory on with CPU can perform read and write operations randomly is called Random Access Memory (RAM). it is read and write memory.it is because CPU can perform both read and write operations on RAM. in this memory, access time is the same for any memory location (address). it is very fast memory. most semiconductor memories and magnetic disk memories are random access memories.
RAM is divided into two types:
1-  DRAM(Dymatic Random Access Memory): This type of RAM is used in most of the computer. in order to maintain data in DRAM, it is refreshed with electric charge again; otherwise data stored into it can be lost.
2-  SRAM(Static Random Access Memory) it does not have to be refreshed with electric charge again  and again.
Sequential Access Memory
this type of memory on with CPU performs read and write operations sequentially is called sequential Access Memory. it is very slow memory. the information is read and stored in sequential order i.e. one after the other. the access time is different for different locations (addresses). Magnetic tape is an example of sequential access memory.
Dynamic Memory Device
the memory devices that must be refreshed with electric charge periodically (again and again) are called dynamics memory devices. these are semiconductor memory devices. if a dynamic memory device is not refreshed with electric charge, information stored into it can be lost.
Static Memory Device
the memory device that do not need to be refreshed with electric charge periodically are called static memory devices. these are semiconductor memory devices.the static memory devices are faster than dynamic memory devices. SRAM is an example of static memory device.
Read-Only Memory (ROM)
in the type of memory, instruction and information are permanently stored. the instructions and information are stored in ROM by the manufacturer at the time of its manufacturing. Once instructions and information re stored in ROM they cannot be changed or removed.


write short notes on the following memory devices? Rating: 4.5 Diposkan Oleh: Ghulam Nabi

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