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Riya

A computer that allows operands to come from main memory is often called a MEMORY TO MEMORY architecture, although that term is not universal. Many computers (including the Pentium) offer more ways of getting at operands. These methods come under the classification of addressing modes. load/store architectures usually have a VERY limited set of addressing modes available memory to memory architectures (like Pentium) often offer LOTS of modes. This flexibility often forces these machines to have variable length instructions (like Pentium).Variable length instructions can make for all sorts of difficulties in making a processor go fast!