I was talking to a former co-worker who worked for McDonnell Douglas Network Systems Company who owned Tymshare at one point, and he had a picture of a 1mb memory from one of the nodes. He passed along this link to the manual for the node processor. http://bitsavers.trailing-edge.com/pdf/tymshare/tymnet/NPD-604_Engine_Famil… Wondering if any survive and are working. It was a 64 bit microword, 32 bit data path TTL logic type machine, similar to one of the ones I worked on pre-bitslice days. Also wonder if the microcode survived. Date on the drawings was 1978 though this manual set is coded as April 1985. thanks Jim