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<ref>https://profiles.nlm.nih.gov/ps/access/BBGHMS.ocr</ref>
<ref>https://profiles.nlm.nih.gov/BB/G/H/L/W/_/bbghlw.pdf</ref>
In 1978, there were half a dozen different operating systems for the PDP-10: [[Incompatible Timesharing System|ITS]] (MIT), [[WAITS]] (Stanford), [[TOPS-10]] (DEC), [[CMU TOPS-10]] (Carnegie Mellon), TENEX ([[Bolt, Beranek and Newman|BBN]]), and [[TOPS-20]] (DEC, based on TENEX).
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A machine-independent version of SAIL called MAINSAIL was developed in the late 1970s and was used to develop many eCAD design tools during the 1980s. MAINSAIL was easily portable to new processors and operating systems, and is still in limited use {{as of|2005|lc=on}}.
==References==
{{Reflist}}
==External links==
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