Acorn
Teletext
Adapter
From underneath the Teletext Adapter, the ribbon cable emerges which connects to the BBC 1MHz bus. Usually with 1MHz bus devices there would be a second connector to allow the next 1MHz bus device in the chain to be attached. However, the Teletext Adapter was designed by Acorn as "last device" in the chain, so there is no second connector and the bus is terminated here.