Thus Apple didn't have to change the internal graphics model of the Mac. This allowed the Mac to send QuickDraw commands to the Printer. Apple essentially wrote a QuickDraw interpreter in PostScript. The Mac internally used QuickDraw for graphics. The reason that Apple chose PostScript for their laser printer was PostScript's programability.
An 8 page per minute, 300 dpi, black and white laser printer. The first product to contain PostScript was the Apple LaserWriter. You can write arbitrary programs in the PostScript language. PostScript is also a programming language. It is a language used by the computer to describe to the printer what the page should look like. PostScript is primarily a Page Description Language. Eventually, Adobe released the specifications for Type 1 fonts, but by then it was too late. OpenType was created by third parties, so that hinting would be available to others. Adobe wanted to keep a monopoly on the quality type business.
Third parties could produce fonts, but not with hinting. The problem was that Type 1 was a proprietary Adobe format.
