For everyone asking why the photo was taken when the driver wasn't speeding:

According to the article, this was a mobile camera, i.e. manually opperated by a police traffic officer, from within a marked (and normally very visible) van on the side of the road. Therefore the officers would have been able to take the photo when they saw the guy mooning them.

Sinclair:

*doffs hat* :o) You are of course correct.

Either way, he was a ruddy clever chap.

Paul

Brashlosan:

Most scopes have an X-Y mode that uses the two inputs to control the position of the beam, with a third discrete input to turn it on and off.

I did something like this at university. We built Z80 based 8-bit micro computers and then hooked up D-to-A converters to control a scope to use as a screen.

Most of us got a few lines and maybe some text on the screen, but my mate shamed the lot of us by having a Cobra MkII (from Elite) spinning in 3D. He had coded up a wireframe system for it in a couple of nights (hi Matt if you are reading this). Utterly brill, and unsurprisingly won the class prize for best demonstrator.

Paul