Comment by bitwize

In the early 1980s there was a CP/M and MS-DOS program called Fancy Font that worked with Epson MX-80 printers. When you put the printer in graphics mode, it can position the pixels vertically with distances as small as 1/3 of the distance between pins. I'm not sure whether it moves the platen or moves the pins within the print head, but the upshot is that with 8 pins available in graphics mode, with 3 passes of the print head you can get 24 pixels of vertical resolution in one line.

Fancy Font rendered marked-up text on the computer using one or more of the supplied, or user-created, proportional bitmap fonts, and then used this technique in the Epson's graphics mode to print out very high quality (for an Epson MX-80), proportionally spaced, "typeset" text. Many a church newsletter and the like were rendered in Fancy Font at the dawn of the 1980s, and the program even received support for those new-fangled, high-resolution "laser printers" in its latter days, but as the Macintosh and other GUI-based WYSIWYG desktop publishing solutions became ascendant, Fancy Font faded into memory.