The Cox 630B Genlock board is an add on for both the BBC Micro and Master series computers. Although this board is not part of the Domesday AIV system it can be a useful addition when experimenting with video. The article explains how the board works and how it should be connected to a BBC Master. Since the pin outs for the board are included it is also easily possible to connect the board to a BBC Micro using the schematic diagram of the micro as reference.
Recreating the Domesday Experience