Just to chime in with more 68k nostalgia and trivia: The 68000 didn't have cache - but 68010 did.
Three whole instructions worth of cache.
"Wha...?" you might say? Tha' heck good is that? The point was that the 3-instruction cache could cache tight loops, like the kind you would use for mem-to-mem copies, which is a terribly common thing to do. I put one in my Amiga 1000 (geez, did I hack that thing...) and got about a 10% overall system performance increase.
It was neat! More lovely details here: http://www.memphisamigagroup.net/diskmags/198803/68010-kit/M...