The ingenuity/insanity of some people never fails to amaze me. The scale of the workings used to make this 5x10 character display, using only redstone, is dauntingly huge.
Created by Koala_Steamed this thing can load saved files, does upper- and lower-case, numbers and symbols, and processes it all "through a single line of redstone".
Here are the 'specs':
5x10, 50 character limit monitor using 16 segment display. There are 7.357x10^92 different combinations the screen can show, all of which can be controlled from 1 line.
And here it is in action: