> I think the MMU was introduced with the 68020
From: https://news.ycombinator.com/item?id=34762508
"The Sun-1 workstation used a Motorola 68000 CPU at 10MHz. This was paired with an in-house designed MMU. It had 256K zero wait state memory with parity, and 32K EPROM memory."The Sun-1 MMU was segment and page registers indexed hierarchically off the physical addresses.
It was a full page based system with segment and page level sharing and protection.
The 68000 didn't support restart from page faults, so the runtime model was indeed segment level swapping. (Note - not what Linux decided to call swapping)
Most of these early m68k UNIX boxes used the 68010 for that reason.
Besides the tight loop optimization, the other 68010 changes, like move from SR being privileged (new from CCP unprivileged) are bugfixes.