I want to try old versions of UNIX for fun, but I don't know where to get them. Is there a way to download them?
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1which versions are you talking about? ... are those versions open source? – jsotola Jan 31 '21 at 10:15
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@jsotola Whatever, but I'm most interested in the first one. – Yav Jan 31 '21 at 10:17
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1do you have the hardware to run it on? ... I'm pretty sure that it would not run on an intel platform – jsotola Jan 31 '21 at 10:18
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@jsotola I want to run it on a QEMU/KVM virtual machine, so it will probaly work. – Yav Jan 31 '21 at 10:21
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Which Unix? https://en.wikipedia.org/wiki/File:Unix_history-simple.svg – Artem S. Tashkinov Jan 31 '21 at 10:29
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1i am not so sure that QEMU will emulate a DEC minicomputer – jsotola Jan 31 '21 at 10:29
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In short, download them from TUHS/PUPS and run them on SIMH.
See https://minnie.tuhs.org/PUPS/pupsfaq.html, https://www.in-ulm.de/~mascheck/various/ancient/ and https://unixarchive.cn-k.de/Documentation/PUPS/pupsfaq.html#emulators

Kusalananda
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James Youngman
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Those three links are woefully out of date and are marked "This page and everything under PUPS/ is kept to preserve the historical record. It's all out of date". Use https://www.tuhs.org/ instead (The Unix Heritage Society.) – fpmurphy Jan 31 '21 at 13:17