Yeah, before postscript, printers all tended to use their own language. Apple was incredibly good at popularizing technology invented elsewhere. Xerox PARC basically invented the desktop metaphor, the mouse and various other technologies but they probably never would have gone anywhere if not borrowed by Apple (and later Microsoft). Adobe invented postscript but it probably never would have went anywhere, at least in the consumer world, without Apple. It's a big reason why Apple became the king of desktop publishing. Microsoft never could quite catch up in that regard.
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