Does anyone have documentation on the PDP-7 instruction set and hardware? I know that the PDP-7 is a superset of the PDP-4, but I can't even find much on what instructions the -4 supported (let alone the extended memory and device control operations). A Google session this morning was not useful. -- --------------------------------- personal: http://www.armory.com/~spectre/ --- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- Do not innovate unnecessarily. -- "The Tick" -------------------------------