What I said there was my answer to what I thought was a reasonable interpretation of this part of your question:
Said question was followed immediately by the mention of the '030 so I logically assumed you were asking if there was a version of the 80386 that had "memory management", which I interpreted as "paging support", as an optional external component, IE, like the 68020, and the answer to *that* is what I said, which is "no, it's always been built-in except for this weird rarely-used 386SX variant". Apparently that wasn't the question you were asking, but in that case what *was* the question? If by "memory management chip" you meant something like a VLSI DRAM controller (vs. a RAM controller made out of discrete logic or PALs), well... that was the very wrong way to ask.
Regarding the Mac II and it's possession of an HMMU, well, so what? First, the HMMU is not a full-featured paging unit. (So far as I'm aware it's essentially limited to remapping the Mac's memory map into... what, two and a half? static arrangements.) And secondly, there were a number of 680x0 machines using both the 68020 and the MMU-less
68EC030-variant of the 68030 that lacked any kind of mapping/paging hardware so it's not a given that any particular Motorola-based machine has a "memory management chip" comparable to the support built into the 80386.
(Some 68020-based machines that had MMUs didn't even use the standard Motorola 68851; Sun-3 workstations were built around their own discrete-logic unit that was simpler but faster than the Motorola one, so it's hard to really say things like the "Mac IIx was something of a standard" and have it mean anything. Motorola-based computers were *all* over the map.)
