Score! I'm not planning to scan all of these in unless someone really cares and has a better scanner than I do. I'm going to prioritize the following: 516-10, -11, -18 Ring Formats 516-12 Specifications for the Node Modem Interface 516-22 A Repeater for the Node Modem 516-28 I/O Ring Device Codes 516-36 Node Modem Interface for Computer Terminals 516-72 Node Test 516-73 Node I/O Software 516-57 Format for the 516 Node - TIU Spider Interface 516-67 Node Format for PDP-11 Jon