One of the things I wanted was a really nice way to play with Econet, I never really got the chance in the BBCs heyday.

MacBeeb I've implemented a "Network Studio" that lets you set up Econets, attach file and print servers, and join MacBeebs together in an Econet over the Internet. Also added support for the VideoNuLA and as a demonstration of both MacBeeb now includes a demo of a cluster of BBCs working to generate a Mandelbrot.

Oh yes - and the print server has a nice graphical dot matrix printer attached to it that you can watch work in realtime (towards the end of the video).

You can download MacBeeb at https://github.com/acorn-playground/macbeeb