Back when I was writing code for the Apple ][ (long-hand, on graph paper), I worked out graphics layouts by drawing my pixels four to a square on the graph pape

Back when I was writing code for the Apple ][ (long-hand, on graph paper), I worked out graphics layouts by drawing my pixels four to a square on the graph paper, representing each pixel with a circle. I also never forgot that (a) the pixels were actually kind of rectangular and (2) in hires graphics mode, if you viewed things as 280x192, adjacent pixels were either •• and • or • and •• depending on the high bit of the byte that had the bitmap data. I think it might have been possible to get •◦• where one RGB-triple was split across bytes.