[p_l]

Apple didn't support anything other than PostScript natively at the time, so their printers came with postscript support. HP made special models for use with Macs that shipped with PostScript included.

[tonyedgecombe]

Apple sold a ton of printers without PostScript:

https://en.wikipedia.org/wiki/List_of_Apple_printers

The earliest ones pre-dated PostScript by years.