Click new message to create a new message. Unrecognized characters are displayed as a box, but it should recognize every character on a standard United States keyboard.
Render time may lag for old computers, old browsers, old flash plugins, etc but it works smoothly on my computer.
Internal arrays of font characters are compressed into essentially a big "display" list of 1s and 0s (on and off), simulating binary code. This list is cycled through in an endless loop. Any message is possible, containing any keyboard character. Unrecognized characters are output as a solid rectangle.
Reimagining of Textboard (http://scratch.mit.edu/projects/2965449) using a modified engine from Super Polyboard (http://scratch.mit.edu/projects/10580011).