Inside the Basilica of St Mary Major in Rome, people are queuing to take selfies in front of an ordinary plywood panel. As one of the Seven Pilgrim Churches in Italy’s capital, the basilica ...

and there are 16 bits of parallel I/O from a 65C22 VIA. The ROM is loaded up with OSI Basic. The real trick here is the front panel, though. Sixteen toggle switches allow the front panel operator ...