On Tue, Nov 22, 2016 at 8:13 PM, Guy Sotomayor Jr <g...@shiresoft.com> wrote:
> > > On Nov 22, 2016, at 4:40 PM, Josh Dersch <dersc...@gmail.com> wrote: > > > > > > So... maybe I just completely missed the memo on this, and maybe there's > still something wrong with my backplane... is it possible that slot 9 of > the 11/40's CPU backplane is wired *specifically* for an M7800? I guess I > need to spend some time tonight seeing what the differences are... but now > I need to go attend to a cranky 2yo who just woke up from a nap… > > > > I seem to recall something similar with one of the 11/40’s I was working > on. I believe that because the 11/40 CPU backplane is wired for an M787 > that things don’t work quite right if you try and install an M7856 into the > SPC slot in the backplane and try and use it and not the M787. There is a > way to jumper the CPU backplane so you can use na M7856 and not the M787. > I haven’t really investigated it in detail (and it’s been a long time since > I messed around with the 11/40 at that level). > > TTFN - Guy > > I have my 11/40 fired up right now too. I can load BASIC and I have a M9312 with a M7800 that returns serial signals/monitor running. I have the CPU backplane, two core planes (empty), a DD11B and an DD11C. I can operate without a grant card in slot, but I can't boot up using RL02 either way, still trying to track down if I have a UNIBUS issue. If there is something I can measure for you, for comparison purposes, let me know. I will be around tomorrow too during the day. I live near Phila, it's 845PM Tuesday at the moment here. BIll