Multiprocessing for the Impoverished: a multi-6809 system (1993)

This is what Jef Raskin imagined for the Apple Macintosh, before the 68000 processor was adopted instead. It was supposed to be a low cost computer for the masses. https://www.folklore.org/StoryView.py?project=Macintosh&stor...

I did not know this was something that I wanted to do. Are there any more examples of building a multiprocessor system?

Edit: there does seem to be lots of single processor z80 computers online, which is nice.

The rest of the articles: http://www.bradrodriguez.com/papers/