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    No PDP-11 is "dumb" :-) Commented Jul 3, 2020 at 15:19
  • It might be better to specify the PDP-11 model in the title, instead of saying "dumb". Commented Jul 3, 2020 at 16:27
  • Might be the case that the emulator isn't an exact match for any real PDP-11. Commented Jul 3, 2020 at 16:30
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    @another-dave my intention is that it is an 11/20 (now that I have looked up the details of what I have built). I am sure I have bugs, hence the need to run various OS on it Commented Jul 3, 2020 at 21:51
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    You might care to look into running the MAINDEC hardware diagnostics. There appear to be papertape images at bitsavers. (I can't offer any advice; field service guys ran those, not programmers). Commented Jul 3, 2020 at 22:41