Further 11/40 unibus questions...

I always used a M930 in the 11/40 and older machines, and the M9300 in the 11/34 and newer machines. I have no way to check on the differences now. now. Also, there may be a trick using MOS in an 11/40. Paul On Mon, Jun 1, 2009 at 3:23 AM, Josh Dersch <derschjo at mail.msu.edu>wrote: >> The machine seems to do something (for a short while that is). >> The only thing I can say is what I have encountered. I was triggered >> when you wrote that you have the M7856 in slot 9 ... make sure that the >> CA1-CB1 (NPG) pins are wired together on the backplane! The M7856 is >> one of the modules that does not use NPG, but also does NOT connect the >> two pins on the module! I have that written on my webpage www.pdp-11.nl >> (peripheral - comm - interface modules - DL11-W). >> I remember that I soldered a wire on the module to connect those two >> pins, >> as I did not want to mess with the backplane ... If you do so, make sure >> that no flux and tin gets on the contact fingers! >> >> - Henk. >> >> >> >> > Thanks -- installed the NPG jumper for slot 9, no change. > > Here's a question: The M9300 Ian lent me has three jumpers, labeled as > follows: > > W1 : "Remove jumper for beginning of non processor bus termination" > W2 : "Remove jumper for end of bus termination" > W3 : "Remove jumper for end of processor bus termination" > > Currently, W1 is installed, W2 and W3 are removed. Is this correct? > > I'm curious what is meant by "processor bus" vs. just "bus" in this > context -- can someone fill me in? > > Thanks, > Josh > > >