It was written.... I have a number of PDP-11 software manuals, processor manuals, a few books & even a few software mag tapes from when I had worked at Digital Equipment. I also have a number of processor manuals & some schematics for DEC System 10 & 20. Would you be interested in them or know someone who would like them? The system 10 & 20 schematics piqued my interest. If anyone wants to follow up on this, email me off list for contact details. J