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Computer Memory
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- 2. Content :- Memoryand its types. RAM and ROM. Types of RAM and RAM. Cache memory.
- 3. Q. What iscomputer memory? Ans:- Computer memory is any physical device Capable of storing information temporarily or permanently .
- 4. Types of memory:- 1.Primary memory 2. Secondary memory
- 5. Primary memory:- It isalso called main memory. Primary memory holds only those data and instruction on which computer is currently working.It has limited capacity and data is lost when power is switched off.It is generally made up of semi-conductor devices. Example-RAM.
- 6. Secondary memory:- This typeof memory is also known as external memory or non-volatile. These are used for storing data permanently. Example-HDD.
- 7. RAM ROM 1. Standsfor random access memory. 1. Stands for read only memory. 2. Ram is a read and write memory. 2. Normally ROM is read only memory and it can not be over written. 3. Ram is faster. 3. ROM is slower than RAM. 4. RAM is volatile memory. 4.ROM is non-volatile memory. 5. Price of RAM is high. 5.ROM is cheaper . 6.RAM chips are bigger in size. 6.ROM chips are smaller in size.
- 8. Types of RAM:- Static RAM (SRAM) Dynamic RAM (DRAM)
- 9. SRAM :- SRAMchips are use matrix of 6 transistor and no capacitor. Transistor do not require power to prevent leakage . SRAM need not be refreshed on regular bases.
- 10. DRAM :- DRAMmust be continually refreshed in order to maintain data. This is done by placing the memory on a refresh circuit that rewrite the data several hundred times per second. DRAM is used in most of computer because it is very cheap and small. It use one register and one capacitor.
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- 12. Types of ROM:- MROM (Masked ROM) PROM (Programmable ROM ) EPROM (Erasable and Programmable ROM) Electrically Erasable and Programmable (EEPROM)
- 13. Cache memory:- Cachememory is very high speed semi conductor memory which can speed up cpu. It act as a buffer between cpu and main memory. It hold the data that is frequently visited by cpu. Data can transfer by OS in cache memory.
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