MEMORY:
It is a storage device. It stores program instructions, data and the results.
There are two kind of memories;
semiconductor memories & magnetic memories. (1): Semiconductor
memories are faster, smaller, and lighter and consume less power.
Semiconductor memories are used as the main memory of a computer. (2):
Magnetic memories are slow but they are cheaper than semiconductor
memories. Magnetic memories are used as the secondary memories of a
computer for bulk storage of data and information’s.
If a memory stores N- words of information each word being of m bits, we say
it is a N x m memory. E.g. 8x4 memory means there are 8 words and each word
containing 4- bit of information (called nibble). 8 words are stored at 8-memory
locations and these memory locations are clearly identified by 8 unique
addresses.
