If you can believe the TV series "The Americans", the Soviets went to a lot of trouble to steal the ARPAnet IMP code! One episode clearly shows an ARPAnet IMP. "'The Americans' was created by Joe Weisberg, a former CIA officer." https://en.wikipedia.org/wiki/The_Americans_%282013_TV_series%29 http://www.tv.com/shows/the-americans-2013/arpanet-2999754/ At 10:06 AM 10/8/2014, Bernie Cosell wrote:
Actually, there has just been good luck scanning and OCR'ing old listings. I had a copy of the old ARPAnet IMP code. And one team managed to OCR it [so it is now searchable!] and another team figured out the assembler for it [I wrote some kind of an awful kludge based on our PDP-1 assembler, but I'll be damned if they didn't manage to get the thing to assemble correctly!!] and another team implements a DDP516 emulator. And there's actually a 5-node ARPAnet *running* on a friend's computer.