[zabzonk]

I was convinced that VMS's versioned files thing was DEC's cunning plan to sell more disk drive space (though I didn't and still don't know what the underlying mechanism was) - I was quite glad when I learned how to turn it off, though.

[vincent-manis]

Versioned files existed in Tenex, developed by Bolt Beranek and Newman in the early 1970s; version numbering was based on a similar feature in MIT's Incompatible Timesharing System. DEC's variant of Tenex was eventually called TOPS-20. Many features of VAX/VMS were influenced by Tenex/Tops-20.