SpiNNaker[0] is a species of that, with multi-dimensional connections in a toroidal surface configuration. It's ARM-based, largely because the chief developer/project head is Steve Furber. Along with interviews concerning the BBC Micro and ARM, Computerphile did a video with Furber concerning SPiNNaker[1].
Yes SpiNNaker looks very cool, also of course the BBC Micro connection as you say. I do wonder what the network architecture is, so now I'm going to have to watch that video you posted :-)
Edit: It's a toroid, which seems an unusual choice (because 2D) for something that's meant to simulate a brain. I wonder if a simple 3D cubic connection network would have been possible by adding more links between physically adjacent boards.
Edit: It's a toroid, which seems an unusual choice (because 2D) for something that's meant to simulate a brain. I wonder if a simple 3D cubic connection network would have been possible by adding more links between physically adjacent boards.