not pictured, but uniball eye micro was my goat for high school and college. I had to do british standardized exams in high school which required black pen (not pencil). these guys write super smoothly and create really nice lines, but they take a sec or two to dry so you gotta be careful not to smudge.
I think #1 in the pic is a thicker version of these
So you write out all your commands as machine code I assume? wait no, obviously you set the transistor state manually with an electron gun?