History of memory

History of memory:-
In 1949 to 1952 developed Magnetic core memory of Computer.
But 1st memory is vacuum tubes of Computer, it can store data. In 1960 became magnetic memory. Magnetic memory is smaller from vacuum tubes. In 1970 develop Semiconductor chips are the type of memory we use today. DRAM(Dynamic random access memory) is the most common kind of random access memory .RAM(random access memory) for personal computers. The data the DRAM chip holds has to be periodically refreshed. SRAM (Static random access memory) doesn't need to be refreshed
In 1834 used punch card (memory of Computer) punch card is very low speed for processing. This time Charles Babbage will create an "Analytical Engine" .the flip-flop is the most common type of memory element of computer. That is Fast computer circuitry.
Of the world.