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.
Using the touch screen. The touch screen on certain tablet PCs allows you to make selections or activate items on the screen using a pointed object, such as the pen or your fingernail. Not all tablets are equipped with a touch screen. See the documentation that came with the product for details.