On Fri, Sep 17, 2021 at 8:10 AM Roland via TUHS wrote: > Hello Unix fanatics, > > I have a PDP11/20 and I would love to run an early Unix version on it. > I've been working on the hardware for a while and I'm getting more and more > of the pieces back online again. The configuration will be two RK05 hard > disks, TU56H tape, PC11 paper tape reader/puncher and a RX01 floppy drive. > Unfortunately I don't have a MMU or paging option. But it seems that the > earliest versions of Unix do not need the extra memory. > > Does anyone have RK05 disk images for these early Unix versions? That > would be a great help. Otherwise it would be great to have some input about > how to create a bootable Unix pack for this machine. > 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... 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. Warner > A bit about the hardware restoring is on the vcfed forum: > https://www.vcfed.org/forum/forum/genres/dec/78961-rk05-disk-drive-versions > https://www.vcfed.org/forum/forum/genres/dec/80723-pdp11-20-restoring > > Booting RT11 from RK05 > https://youtu.be/k0tiUcRBPQA > TU56H tape drive back online > https://youtu.be/_ZJK3QP9gRA > > Thanks in advance! > Roland Huisman > > >