Main Memory

Q.       Write down the differences between RAM and ROM.

Ans.: RAM:

·   RAM stands for Random Access Memory.

·   Volatile memory.

·   Directly access data from processor.

·   Storage data temporarily.

·   Built in IC. No moveable parts.

·   User can read or write into it

·   For any type of processing, user must store program and data into RAM

            ROM:

·   ROM stands Read Only Memory.

·   Nonvolatile memory.

·   Can’t directly data from process without RAM.

·   Storage data permanently.

·   Built in Disk or moveable parts.

·   User can only read form it

·   Manufacturer stores instruction into the Rom permanently

Q.       What is the difference between SRAM and DRAM?

Ans.: SRAM:

·   SRAM Stands for Static Random Access Memory

·   High speed RAM

·   SRAM is Costly

·   Does not require refreshing

·   Generally used for cache

·   Control complexity is less

            DRAM:

·   DRAM stands for Dynamic Random Access Memory

·   Relatively slower

·   Relatively low cost

·   Requires refreshing periodically

Q.       What is Cache Memory?

Ans.:  Cache Memory: The speed of CPU is extremely high compared to the access time of main memory. A small memory chip is attached between CPU and Main memory whose access time is very close to the processing speed of CPU. It is called CACHE memory. Cache memories are high-speed buffers for holding recently accessed data in main memory.