Q-Bus fear and other DEC busses ....

I read a web article the other day where the guy describes the various forms of the Qbus and he also said that you could fry certain cards when you stick'em in a wrong version of the Qbus. Since I have a uVAX II and a PDP11/03 I would want to know if I can mix and much cards with thoese busses or if I would fry a K[ZF]QSA board sticking it into the wrong bus. Also, why was the need for grant continuity cards an advantage? The OMNIBUS didn't need it but the UNIBUS (and Q-bus?) do. Also, what's the deal about grant continuity cards, they seem to just have a few lines shorted. In the UNIBUS box next to my VAX 11 it has some intermediary open slots but only one grant card plugged in. How could that work? Also, why can you stick 1x or 2x cards into the different sections, is there a difference where you put them? Why is the feed to the UNIBUS only a 2x card and where must you plug that? Is it magic? Are there UNIBUS backplanes with more than 9 rows? so many questions :-) -Gunther -- Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org Medical Information Scientist Regenstrief Institute for Health Care Adjunct Assistant Professor Indiana University School of Medicine tel:1(317)630-7960 http://aurora.regenstrief.org