VM (operating system)

Dutch computer scientist (1924–2018)

family of IBM virtual machine operating systems

operating system

thumb|right|An Informatics General computer programmer using XEDIT on an IBM 3279 terminal thumb|An early version of XEDIT from 1982, as displayed on a 3270 terminal emulator. XEDIT is a visual editor for VM/CMS, primarily using block mode IBM 3270 terminals. It also works on line-mode terminals.

1967 IBM mainframe model with virtual memory and 32-bit addressing