Hi Warner,

Thanks for your reply!

V5 is the earliest Unix we have contemporary images from. We have fragments from everything else earlier, including files scavenged/recovered from early DECtapes and some code recovered from kernel listings from a Unix course that was put together by Bell Labs...

What I found on Wikipedia about Unix V5 is that is needs an MMU. " 5th Edition Targeted the PDP-11/40 and other 11 models with 18 bit addresses." Because it uses 18 bit address space it probably expects 248K of memory. My machine does not have a paging option or mmu. So I think that means that I can't use V5 unfortunately...

The Unix 1972 project that some TUHS members did. I think it's in the TUHS distribution archive, but also on github. I think Warren Toomey's repo is the canonical one https://github.com/DoctorWkt/unix-jun72 but https://github.com/c3x04/Unix-1st-Edition-jun72 has a couple of newer fixes for a docker file to contain the simh simulator. I'm unsure what hardware that's supported, though. The machine file suggests:

rk03/rk11 177400 disk RK
dc11 174000 tty? (not supp?)
tc11/tu56 177340 dec tape DTn (not showing up in simh?)
rf11/rs11 177460 fixed head disk RF
kw11-l 177546 clock CLK
pc11 177550 paper tape PTR/PTP
asr-33 177560 tty? TTI, TTO

which has an RK03, not sure how close that is to an RK05, so some tweaks may be needed.

That RK03 is a Diablo 31. It uses the same packs and same interface as the RK05 and is 100% compatible. The RK05 was build by Digital itself and not by Diablo any more. I have the TC11/TU56, PC11, asr33 tty and KW11-L line clock as well. So that is almost the complete list of devices you showed here...

So if it is possible to generate a RK03/RK05 disk image from that simulator then I think I can put that on a real RK05 disk pack. But I'm completely new in this old Unix era... So if anyone could help to generate such an image then it would be a great help!

Regards, Roland