[apologies for lack of context, been away from cctalk a long time and insufficient recall
of how this cctalk thing works... yet somehow still remember IAS on an 11/70 from the
Pick an RSX layered product and lots of fundamental stuff would probably be compatible
between 11M, 11D, and IAS (and/or 11M+). Find the RSX version and see if IAS is mentioned
as supported in the SPD or other documentation. It often was, and even if it wasn't,
lots of non-priv stuff would just work.
More IAS background from someone (not me) who was there in the IAS development team in DEC
"This page is dedicated to the best of the many PDP-11 operating systems - IAS
I couldn't find anything else on the Web about IAS? but it deserves better than to
fall completely into obscurity.
DEC's approach to operating systems for the PDP-11 was anything but disciplined. New
ones got invented every time some engineer or marketing person blinked. In the early days,
there was a real-time kernel called RSX-11A, designed for memory-resident applications in
what we now call embedded processors. Features got added to this rapidly - code bloat is
nothing new. By the time it got to RSX-11D it had a complete disk-based file system, a
program development environment, and support for every peripheral in the Small Computer
Handbook (and there were plenty of them - peripherals on the PDP-11 obeyed the same
strategic imperatives as operating systems - see above). At this time, a bright young
engineer called Dave Cutler decided that enough was enough, and set out to create a small
system that would do the same, which he called RSX-11M. We all know what happened to him -
and he no longer even has the excuse of youthful excess.