Closed vs. open source timeline.

Re: Sorry for the late add-on ... based on the above and one other post, it looks like you're willing to consider source code from the vendor, so I'd add Burroughs Corporation. The mainframe group (B6500/B6700/B7700/etc) would send the source code out with each release of the operating system. suspect it happened at least somewhat before and after that period. Also, for "available", Hewlett-Packard used to sell the source code for the MPE operating system (on the Classic HP 3000) for $500 in the late 1970s and during the 1980s (I saw a copy purchased in 1977, and purchased a copy circa 1986), and used to sell the source code for MPE XL (later MPE/iX) operating system for about $30,000 in the mid/late 1980s and possibly the 1990s (I've talked to about three companies that purchased it), and used to sell the source for HP-UX (at least in the mid-1990s) (I've talked to one company that purchased it for HP-UX 10.20.) Stan -- Stan Sieler sieler at allegro.com www.allegro.com/sieler/wanted/index.html