370, the exams for that course were just a blast, only exams I've had genuine fun taking in my life. Would have done 470 but I graduated a semester early (that and programming languages courses are ones I retrospectively regret not having taken). Computer Organization and Design 4ed was the one at the time I think - it is Hennessy.

I love computer science now a lot more than I did at the time, heh, but that's part of why I bothered finishing early. The professional environment suits me well.