I know a lot of folks on this list like history, so check this one out: http://www.fas.org/sgp/othergov/doe/lanl/docs1/LA-6943-H.pdf
" Further- more, by using clip leads to short one side of the vacuum-tube flipflops, you could actually change the contents of a register (while the machine was stopped). A skilled operator, like Don Bradford or Verna Ellingson Gardiner, could fetch a word into a register, make a change in it using clip leads, and store it back in memory in about the same time that most modern operators can type a one-line com- mand on a terminal. " enjoy. ron
