Allows you to create a video overlay of 256x192 pixels.
 Supports two text sizes 8x8 (32x24 characters) or 16x32 (16x6 characters). 
Also has routines to draw lines and filled circles.

The object will also generate a complete video signal if no video input is detected. 
(This may not work with all displays as the sync pulses are not exactly standard).
