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.
Thomas Alva Edison announced his invention of the first phonograph, a device for recording an â¦ d replaying sound, on November 21 1877 and he demonstrated the device for the first time on November 29 (it was patented on February 19 1878 as US Patent 200,521).he Dictaphone was still in use in the early 1950's. The first flat, circular record was invented in 1887 by Emile Berliner (1851-1929), a German-born American inventor, who also devised the gramophone to play his disks. Berliner's records were originally made of glass, then zinc, and later, hard rubber.