Ok, I looked around for the instructions on how to assemble the Unix
v1 kernel and couldn't find anything so I tried:
as u0.s u1.s u2.s u3.s u4.s u5.s u6.s u7.s u8.s u9.s ux.s
and that made a.out and I stripped it and it looked like it was around
the same size as /etc/core (it was 16400 bytes rather than 16448 for
some reason).
I'm not sure where Unix v1 is loading the kernel from. I'm guessing
it's /etc/core and if that's the case then I must have been successful
building the kernel. In all the other versions of Unix there was
always a file like 'unix' in the root directory but I guess Unix v1
was different?
Mark