Reminds me of the Control Data CDC 6600's I worked on at NASA/Langley in the early 70's.
They used fixed lengths of twisted pair wire for time delays. (1 foot = 1ns?)
Not even sure I could trace that with a tone tool.
CDC timeshare in public school... my first computer experience!
Paper punch tape programs for extra credit in Physics was kewl.
"Where would we be without the agitators of the world to attach the electrodes
of knowledge to the nipples of ignorance?" ~ Professor "Dick" Soloman
Fred, I know you got some new TT toys or at least they were in transit the last time we spoke. Any updated photos? ^^
"A night sky full of cries. Hearts filled with lies. The contract: is it worth the price?"