This is where the little bit of magic is going to happen!
This is a close-up of the inside of the BBC Master, at the rear of the PCB where the Composite Video connector is. The second processor is just visible in the bottom of the picture. This is the Domesday Machine after all!
Just in front of the second processor are two little black things, which are called transistors. They have three legs on them. The middle one is called the Base, the one on the right is called the Emitter and the one on the left is called something else.
Have you got that? Right, remember it as we continue.