Projector

The projector provides a framebuffer device to computers. They have a resolution of 640 by 480 pixels, with the color format r5g6b5: 5 bits for the red color component, 6 bits for the green color component and 5 bits for the blue color component.

Projectors need to be powered directly to function. The device bus cannot provide enough energy on its own. When insufficiently powered, this is indicated by a red glow in the projector's lens.

On a Linux system, projectors will typically appear as /dev/fbX devices. To send data to the framebuffer, it is possible to write to these devices. For example, to clear a framebuffer one might pipe zeros to the device like so: cat /dev/zero > /dev/fb0.

When using the default Linux distribution, the keyboard may be used, to send input to the virtual terminal, running on the first connected framebuffer.

Computers have to be shut down before installing or removing this component. Installing it while the computer is running will have no effect, removing it may lead to system errors.