​Johnny - yes I stand made more precise.   11's with MMU's do support pages, but the MMU is is base/limits with 1 level page displacement and as you point a not a lot of pages and with only 16 bits of base address the virtual addresses are pretty limited (although as BSD 2.8 and later showed you can do a lot with a bit of care and overlays).

I fairly certain that the original Moto MMU chip worked the same way, as Nick and Les were definitely using the PDP-11/70 as the example, even though those system did have more address bits.   I also, I know that the custom MMU on the Magnolia the system we built at Tektronix with first pre-68K did work that way, as I did it and I too model it from the 11/70.  

In Magnolias case, it was that way because the Altos and Dorado's from PARC did not have an MMU.   Roger Bates was my office mate at Tektronix and one of the HW guys from the Dorado and Altos.  He was the main HW guy on Magnolia had to learn about MMU's from me. But I was once a HW guy too -- and when we built that system those gates in Magnolia were mine :-)  The original OS (Magix 1.0) ran PDP-11 style since that's all the CPU could do (Magix was a V7 like system).   A couple of years later, when the CPU chips were replaced with the first 68010's, the OS was updated to work more like a Vax.   I've forgotten if Roger added a second level at that point, as I had left the project to head back to grad school and I did not do that part of the coding.

Clem