Paul Rickards uses the Silver Reed Colour Pengraph EB50 from 1984 as typewriter and plotter. It’s like vector graphics on a typewriter. Photos and video here.
The Macrocom Method is a text mode trick for PC to use 16-colour hi-res graphics in CGA. The principle was to use only the top two pixel rows of each text character, and remove the rest. Image by VileR.