sentences:  ISPS was well suited to describe relations between the inputs and the outputs of the design and was quickly adopted by commercial teams at DEC, as well as by a number of research teams both in the US and among its NATO allies.The RTM products never took off commercially and DEC stopped marketing them in the mid-1980s, as new techniques and in particular very-large-scale integration (VLSI) became more popular.Separate work done about 1979 at the University of Kaiserslautern produced a language called KARL ("KAiserslautern Register Transfer Language"), which included design calculus language features supporting VLSI chip floorplanning and structured hardware design.