Over the last 6 years I’ve used a lot of computer projectors. Some projectors were a little brighter or had better contrast, some more acurately reproduced colours, and some were a lot smaller and portable than the rest. They all also provided different options for attaching a video source: VGA, Composite, DVI, Component, HDMI. However, I’m not going to talk about all that today. What I’m going to talk about are the projectors which also had a serial or USB connection to the the attached computer.