I also remember the 8051 based TI bluetooth chips which also have some "weird" things going on and has a harvard like architecture just with more memory types.

I also remember the 8051 based TI bluetooth chips which also have some "weird" things going on and has a harvard like architecture just with more memory types. I raise you three types: program memory is also 24bit (using both one 8bit and the 16bit register) and 16bit "external" memory and 256 bytes of mapped registers. I don't know if the compiler actually does this as different types and how it internally handles it. Maybe someone can elaborate on that.