Raspberry Pi
This Raspberry Pi volumetric display is a new spin on LED 3D animations tomshardware.com
Really neat looking. Some of these raspberry pi based personal projects are super cool!
The volumetric display is built using multiple panels—each sporting an array of LEDs. The panels are spun at high speed while the Pi tells each LED when to illuminate. The end result is a 3D effect that you can see no matter which direction you're looking at it from. The framerate and spin speed has to be just right for the effect to work successfully.
PiTrex - Raspberry Pi board for Vectrex ombertech.com
Another project leverating the raspberry pi for some interesting stuff on another Video Game machine. What's neat about this one is that because of the simple architecture of a lot of these older machines, the raspberry pi can basically take over the CPU's job and still use the rest of the hardware of the machine.
The Vectrex CPU, a Motorola 68A09 running at 1.5MHz, controls all of the I/O including display, sound, and controls, via a 6522A VIA chip. These are both connected to the cartridge port, and with the CPU disabled using the HALT signal also at the cartridge port, all of the Vectrex's functions can be controled by an external device. In this case we're using a Raspberry Pi Zero with a 1GHz ARM CPU and 512MB of RAM, powerful enough to emulate arcade machines with vector displays, emulate the Vectrex CPU to load ROM images akin to a multicart, and run custom games written to take advantage of the greater processing power.
The Vectrex is pretty rad. I did a video on mine five years ago. I still have a couple things to fix on it someday - think the video board needs a tune up so it's a little more stable.
PiStorm - Raspberry Pi accelerator for Amiga github.com
This has been out for a while, but now that I have my Amiga 500 mostly working I'm planning on adding one of these to it, at least for the CPU emulation for a speed improvement. I'll probably also try out the memory expansion and harddrive as well. This should make a kick ass Amiga 500!
The PiStorm itself is an adapter board intended to be paired with a Raspberry Pi Model 3A+. It goes in the DIP socket on and acts in place of the CPU, but functionality can be extended beyond simple CPU emulation.