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Computer Memory System
A memory system is a computer is required for storage and subsequent retrieval data and information.
- CPU Register
- Cache Memory
- Main Memory
- Secondary Memory
It consists of a small set of a high-speed register that is internal to the processor and is used as a temporary location where actual processing is done.
Cache Memory is a very special high-speed memory. It is used as a high-speed CPU with synchronization.
The main memory refers that physical memory which is also known as internal to the computer. The main word is used to isolate external mass storage devices such as optical or magnetic disk drives. In other words, we can say that the main memory includes RAM and primary storage. Computers can only manipulate the data in main memory.
- These memories are much larger in size but are not as fast as main memory. This can be used as an overflow memory.
- In case the main memory capacity has been exceeded.
eg: Hard disk, Floppy disk, Compact disk, Magnetic disk, Magnetic Tape, digital versatile disc.
The access mode is a sequential, random, and direct mode method of record retrieval changes as per the selected file/data.
1. Sequential Access Mode:
A memory contains can be accessed sequentially. eg: Magnetic tape
2. Random Access Mode:
Memory can be accessed randomly. Eg: Semiconductor Memories such as RAM & ROM.
3. Direct Access Mode:
Memory can be accessed sequentially as well as randomly. eg: Magnetic Disc, Compact Disc, DVD, HD, FD
Dynamic Vs Statics Memory:
The following Computer Memory System is based on the nature of memory:
Some memories loose information over a period of time these kinds of memory required refreshing.
The memory which requires refreshing is termed as dynamic memory.
eg: DRAM, Which is a dynamic model of capacitors need to change.
The memory which doesn’t require refreshing is termed as static memory.
eg: SRAM, which is the static mode of flip-flop’s sequential circuit doesn’t need to change.
Note: Dynamic memory is slower than static memory.
RAM Vs ROM:
|1||It stands for Random Access Memory.||It stands for Read Only Memory.|
|2||It is volatile.||It is non-volatile.|
|3||It requires refreshing.||It doesn’t require refreshing.|
|4||It is Read-Write memory.||It is only read memory.|
|5||Used by the system program as well as a user program.||Used by only system program.|