Links:
This is a multipart series which does a sysgen, then installs decnet, basic, and some other lanuages:
https://pdp2011.sytse.net/wordpress/pdp-11/sessions/rsx-11m-plus/
The first page describes copying the OS disk from a DQ RD54 to an RP06 disk pack, but that step does not work. Don’t care; the sysgen works fine on the source pack.
Version includes installation from scratch, including sysgen
Another alternative is on retrocmp:
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