price: 12.95 GBP platforms: BBC
Plugs into the Tube port of any BBC Micro via a 40 way ribbon cable.
Requires Raspberry Pi Zero with a suitable MicroSD card and firmware. Can emulate many of the different Co-Processors available to the BBC Micro over the years.
Also suitable for the Acorn Electron, providing you have a compatible tube interface
See the seller's other listings for a HAT version compatible with the larger Pi boards
Review / demo: https://www.youtube.com/watch?v=4IwIPXVNRjs