The more I think about this, the more I'm sure I'm barking up the wrong tree... was not about Unix - it was about TOPS-20. It was a timeline of the system bootstrap activities from power-on to the point where users could log in. I still don't remember where I found it originally, but at least now I'm pretty sure I've been looking in all the wrong places... I believe it originated at CMU, but I don't know for sure that that's where I originally located it. The actual problem I'm trying to solve is, at this point in my professional career, I'm starting to interact with a lot of people (even experienced software developers) who just have no clue of what has to happen to get a computer from the point of "power-on" to the point where they can actually use it to do things. This makes me sad... So, I'm looking for something that I can point these people to that could clue them in... I think the whole bootstrap process is useful to understand for a lot of reasons, partly because it makes you think about all the little fiddly details that have to be attended to to make the computer do what you want - when I was first learning about this, I remember being particularly fascinated by what had to happen to prepare for that moment at which you turn on the MMU, to make sure that the system continues executing in a place you expect it to, in the right processor mode. I know most people that I interact with are using Linux or Windows on Intel-architecture machines, but the boot process for Unix on the PDP-10 or VAX (or even TOPS-20 on the PDP-10) I thought would be a much simpler thing to understand. Though maybe that's the wrong thought process, maybe I should just find something related to Linux that is comparable (even though I think it's more complicated). While searching, I also came across a decent presentation by a friend of mine who teaches at CMU, and discusses hardware that people probably actually work with right now, but I think it would be best consumed along with the actual lecture that it goes with. http://www.cs.cmu.edu/~410-f08/lectures/L20_Bootstrap.pdf Maybe I'll find what I was originally looking for at some point, but after spinning on this for most of the day, I don't think it's related to Unix... --Pat.