In college, we learned assembly programming on Motorolla 68k chips, and were told they were very common and easy to get. I later learned that they used the same chip in the MegaDrive, which was kinda exciting, but also confronted me with the notion that the MegaDrive's "brain" was actually a common off-the-shelf component. The console didn't run fairy dust, or ancient magic, it was just straightforward hardware. Anyway, I was wondering, if the main processor is common, could all the chips used in a MegaDrive be obtained? And if they could, does that mean someone could actually build their own working MegaDrive, that would theoretically work better than any othe form of emulation since it's using original hardware?