[cctalk] PDP 11/24 Unibus Termination and Grant Cards

The 11/24 System Technical Manual says that the terminator (M9302 or M9312) must be installed in the last slot (slot 9) of the backplane, and that all empty slots must have a grant card. What I am not clear on is what they mean by an "empty" slot. Specifically, if I have the CPU, the M7134 memory map and a memory board installed in slots 1-3 and then nothing else except the terminator in slot 9, does this mean I have to install grant cards in slots 4-8? My guess is that this isn't a requirement because the grant cards go in rows C and D while the terminator is rows A and B, but I am hoping someone can confirm this for me please? Thanks Rob