----- Original Message ----- From: "Allan C. Wechsler" <acw@alum.mit.edu> Using so-called "dual rail" logic,
representing each bit in both possible polarities, and generating, at each stage, both possible polarities, allows this to be a general logic family (with speed advantages). There is no need for negation, of course, since one can choose the polarity of any signal arbitrarily. I wonder if it simplifies power supply design to have the total amount of drawn current vary so little.
It probably simplifies it a little, although it's been years since I worked with regulated supplies. The need for regulation is still there because of variations in line voltage and the probable need to keep the supply voltage within narrow limits. Steve Gray