 Its servo-controlled carriage also permitted the use of proportional spaced fonts, where characters occupy a different amount of horizontal space according to their width.The Diablo 630 was so successful that virtually all later daisy wheel printers, as well as many dot matrix printers and even the original Apple Laserwriter either copied its command set or could emulate it.Daisy wheel printers from Diablo and Qume were the dominant high-end output technology for computer and office automation applications by 1980, though high speed non-impact techniques were already entering the market (e.g.