On Sun, May 19, 2019 at 8:05 PM Mister PDP via cctalk <cctalk@classiccmp.org> wrote: > > After that, I decided to try and find out why the > Run/Halt light was not coming on when I hit the switch. Looking at the H11 > schematics, the light relies on the SRUN signal coming off of the > backplane. The problem I am currently facing is I cannot find where the CPU > board generates the SRUN signal. If anyone who is more experienced that me > knows how the M7264 generates the SRUN signal, that would be wonderful.
http://www.bitsavers.org/pdf/dec/pdp11/1103/1103_Schematics.pdf Page 27 of the PDF, LSI-11 CPU MODULE (K8) schematic Grid position B1, the SRUN L signal is driven on to the backplane bus line AF1. I have no idea how the logic works on the M7264 module that drives that signal.