And the 68000 a 24-bit CPU, and boy did that cause trouble when Apple et. al. moved to later versions where those top 8 address bits were significant, especiall

And the 68000 a 24-bit CPU, and boy did that cause trouble when Apple et. al. moved to later versions where those top 8 address bits were significant, especially since the 68000 was introduced when DRAM was really dear, e.g. the barely usable first Macintosh had only 128KiB, i.e. a program had essentially less address space to use than a split I&D PDP-11, which gave you 64KiB of each, with 8KiB of data space reserved for the stack. Less, because it's macroarchitecture is 32 bit, "wasting" bit and bytes here and there if your DRAM is that constrained.