[Simh] Dennis_V6 rk05 image v6root bootable in simh?

[Will Senn]

I'm working along with the v6 course https://pdos.csail.mit.edu/6.828/2003

and I came across instructions for running v6 from 3 rk05 images - 
v6root v6doc v6src. The images in the course are not available on the 
internet, so I went looking to see if TUHS had something similar. I 
found the Dennis_v6 folder with what appear to be gzipped copeis of the 
3 rk05 images. I downloaded the root disk, unpacked it and tried to boot 
in the latest SIMH (tried in earlier versions also):

curl -O -L 
http://www.tuhs.org/Archive/Distributions/Research/Dennis_v6/v6root.gz
gunzip v6root.gz
terra:v6-mit wsenn$ pdp11

PDP-11 simulator V4.0-0 Beta        git commit id: 1d2742ed
sim> att rk0 v6root
sim> boot rk0
Trap stack push abort, PC: 000043 (JSR SP, at 43(R0))
sim>

Does anyone know if this image is actually an rk05 and is bootable 
(bonus points for info on how to tell by looking at the file)?

I run v6 all the time, but I built my environment off Ken Wellsch's tape 
distribution files.



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