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.
In 1946 there was a small number of car phone services begun in St Louis, Missouri, USA. In 1973 the first successful hand-held mobile phone was developed by Martin Cooper. Dr Martin Cooper, a former general manager for the systems division at Motorola, is considered the inventor of the first modern portable handset.