I have designed, and am currently working on, a number of small items for use with this vintage computer - on which I spent far too many hours, back in the day!
RS423 to USB adapter for connecting your Beeb to any modern device with a USP port
A piece of equipment with which to test if a 6502 CPU is faulty or fake.
An individual 5-pin "Domino" DIN plug used for the RS423 connector.
Replica keyboard cable for the BBC Micro. As close as you'll get to the original pattern!
Reverse engineered 1770 DFS daughter board circuit diagram. I'll soon be able to supply replica PCB's for anyone who has a damaged one.