This hazard is present only in pipelines that write in more than one pipe stage or allow an instruction to proceed even when a previous instruction is stalled. The DLX integer pipeline writes a register only in WB and avoids this class of hazards.
The first touchscreen phone was launched in 1992 by IBM.The IBM Simon is also referred as the first smartphone.Simon is the first smartphone to be incorporated with the features of a PDA.
The father of the touchscreen technology is Dr. Samuel Hurst. In 1971, while he was working as an instructor at the University of Kentucky Research Foundation, he had to read a great volume of information during the graduation exams and it took whole two months so that two students could graduate.