The 386 was a full 32-bit processor: the 386SX was a cheaper variant with a 16-bit data bus. In that sense the SX wasn't a million miles removed from the 68000

The 386 was a full 32-bit processor: the 386SX was a cheaper variant with a 16-bit data bus. In that sense the SX wasn't a million miles removed from the 68000 and 68010 processors, which similarly operated with 16-bit data buses. You may be confusing the operating system with the processors. Windows 3.x and earlier were 16-bit operating systems that were run on PCs well into the 32-bit era. Windows for Workgroups 3.11 was, I believe, the first full 32-bit version of Windows. 32-bit Windows only became widespread, at least amongst consumers, with the release of Windows 95.