I found a 1985 vintage Daisy Wheel #printer recently. It's basically an electric typewriter (sans keyboard) with a serial port. I have no docs but it seems to have similar guts to an old Atari printer which has PDFs floating around. It's enough that I have sorted out how to print all characters, and tweak the vertical and horizontal pitch.
#ASCII art is fun but I decided to make graphics... by typing lots of periods. I dig it. It has a kind of offset dithered look: #screenless#retro