A hazard is created whenever there is a dependence between instructions, and they are close enough that the overlap caused by pipelining would change the order of access to an operand. Our example hazards have all been with register operands, but it is also possible to create a dependence by writing and reading the same memory location. In DLX pipeline, however, memory references are always kept in order, preventing this type of hazard from arising.
It was actually a few years later, in the year 1898 to be exact, when this idea had taken its existence. Vlademar Poulsen was the person who had invented the earlier concept of Oberlin. In 1928, Fritz Pfleumer developed the magnetic tape. But it was not that compact as how the modern cassette player was.
Later, Drew addressed another issue â the need to seal cellophane without water. Drew invented Scotch Cellulose Tape in 1930, giving bakers and grocers a quick, waterproof method to seal packages. Soon, Scotch Brand tape would enter the household, allowing us to make simple fixes to a variety of items. The first countertop tape dispenser, introduced in 1932, was made from cast iron. It weighed nearly seven pounds! Seven years later the company produced the âsnailâ â the handheld tape dispenser. The initial version was made from stamped sheet metal, with a plastic model emerging in 1940.