17 Sep
2021
17 Sep
'21
8:33 p.m.
On Fri, Sep 17, 2021 at 8:10 AM Roland via TUHS <tuhs(a)minnie.tuhs.org>
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