On 4/18/2019 2:27 PM, Paul Koning via cctalk wrote: > my memory is that DSM-11 is an operating system all its own, not just a language processor running on top of a standard OS like RSTS. In the late 1980s and early 1990s, we used DSM running on VMS 4.7 for a nationwide (United States) mortgage credit reporting system. Cheers, Dan