On Monday, April 3, 2023 at 11:13:26 AM UTC-7, Bob Eager wrote: (snip) > I think the IBM paper is dated around 1965. While designing the virtual addressing system for the 360/67, IBM had a specially modified 360/40 to practice on. That ran CP-40, and then led to CP-67 on the 360/67. That was in 1967, and led to CP/CMS.