[tyingq]

Many of the ATMEL 8 bit chips do have an external memory bus. Not used in this case, but it's possible.

Sometimes it's pretty blurry what is a microcontroller and what is a microprocessor. The PIC32MZ/DA has an integrated Graphics Controller and 32MB of DRAM.

[girvo]

There’s a BSD 2.11 port for PIC32:

http://retrobsd.org/wiki/doku.php/start

[Gracana]

The AVR can't execute programs from the data bus, which means no execution from RAM or external memory, though you could write a virtual machine that could do so.

[pinewurst]

http://geoffg.net/maximite.html

That’s a cool PIC32 home computer - PIC32 is MIPS btw far beyond the old 8 bits though...