De gustibus. I used it for many years, and am quite at home in it. I think it's a marvel of functionality/size - at the time it came out, not much bigger than DEC PDP-11 OS's, but with a 'big system' feel to it (which they _definitely_ did not) - in fact, _better_ than most big systems of the day. But I can see it would be rather too simple (and in the kernel inelegant, code-wise, by today's standards - see below) for many. V7 is not that different, in terms of user experience, from V6, though. Sorry, that page is kind of a mish-mosh. Most of the stuff that's talked about there is for user commands, not the kernel. There are only a few kernel changes (lseek() and mdate(), and param.c so that the new 'si' command can get thing from param.h without having to have it compiled in), and they are all small. I'm a little confused as to what your goal is here. Get V6 running on some other architecture? Upgrade V6 for some goal which I am not aware of? I know you probably said something in an earlier email, sorry, I don't recall. Anyway, if you're going to do anything with V6 kernel code, you need to be aware that it's really idiosyncratic - a lot of its written in a very early dialect of C, and while things like 'a =+ b' -> 'a += b' and 'int a 1' -> 'int a = 1' are pretty easy to fix, there are lots of intances of int's being used as pointers to several different kinds of structures, etc, etc. If you want to move an early, small Unix to something other than a PDP-11, V7 is probably a much better bet. There are a couple of early TCP/IP's which ran outside the kernel, but I think the standard Berkeley one might be a handful to move out. Noel