Some images I made back in 1983 with a Tektronix 4105 terminal. This was an early color terminal. It wasn't a personal computer; just a terminal attached to a main computer, in this case a VAX computer. It had large pixels and there were only 8 colors available. In order to produce intermediate colors, you could 'dither' the colors, that is, alternate the colors from pixel to pixel. You can see the dithering in the polkadots in the first image.