We did printing with heads on specialized form paper. If you wanted to change the font you opened up the printer, took out the head, and replaced it with a n

We did printing with heads on specialized form paper. If you wanted to change the font you opened up the printer, took out the head, and replaced it with a new head. The character set standard defined how the head was physically manufactured. You want all the printers in your fleet to produce identical output. In 1985 "OS Support" meant picking up the phone and talking to the vendor directly.