If you have a M7856 which is a SLU and LTC on one board you don’t need an M787.
I assume that they you have the EIS board installed, you have the 3 jumper cables between the EIS and the uCode board. KM11s will help in diagnosing these issues as it allows you to single step through the uCode. TTFN - Guy > On Feb 13, 2017, at 8:16 AM, william degnan <[email protected]> wrote: > > Question - I am working on a PDP 11 KE11E M7238 EIS board (for PDP 11/40) > which causes the CPU to crash when installed; front panel not responsive, > can't boot XXDP. I installed a removable jumper so I can flip jumper > configs back and forth between EIS installed/not installed. Without the > EIS the system works fine, can boot OS's that do not require it like RT11. > > As discussed before the EIS is required if I want to boot up UNIX 6 on the > 11/40, which is a goal of mine. > > Thought - I don't have a LW11L, M787 installed. This is a the Line TIme > Clock option card. Do you think that maybe the EIS board requires this for > some reason, even though there are no references to this as a requirement > in any docs I can find? Maybe the docs writers assume it's installed? I > only wonder because any time I have seen the M7238 installed in an 11/40 I > have also seen a M787. > > I could swap out the current 11/40 backplane with a backplane that has the > jumpers for the M787 already removed, but I only want to do this if it's > necessary. When we were talking before I neglected to mention I had no > M787, you may have assumed I did. > > > > Bill
