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
Find out more / buy at: https://rover.ebay.com/rover/1/710-53481-19255-0/1?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fitm%2FACORN-BBC-MODEL-B-B-MASTER-128-RASPBERRY-PI-ZERO-CO-PROCESSOR-ADAPTER-PCB%2F254701348290%3Fhash%3Ditem3b4d6225c2%3Ag%3Auv0AAOSwOUJbhsgi&campid=5338662899&toolid=10001&customid=