68000 - the first!
68010 - as above but with some onboard cache and some extra instructions
a 3-word instruction cache I believe
68020 - full 32bit architecture, seperate inst/data cache
68030 - 68020 with turbo chargers on steriods.
The 020 has only the instruction cache. The 030 has both (256 bytes each), and the internal MMU. No turbos or steroids I don't think
