I don't know if this has been linked to before, but I found it to have a few useful documents, including the System User's Guide to RT-11 V3. Gordon Bell's home page: http://research.microsoft.com/~gbell/ His CyberMuseum: http://research.microsoft.com/~gbell/CyberMuseumPubs.htm The DEC part of his CyberMuseum: http://research.microsoft.com/Users/gbell/Digital/DECMuseum.htm -- Jeffrey Sharp