Also worth pointing out is that ECL processors were specialized hot rods, not in the main line of contemporary computer systems aside from supercomputers and the very high end of mainframes like the top of the line DEC KL10 PDP-10 CPU, Vax 8000 family, and IBM 360&#x2F;91.<p>They were expensive to design and run (traded power dissipation for speed), and eventually CMOS caught up with ECL.