Apple has donated the MacPaint source code to the Computer History Museum. As with so many other components of the original Macintosh, MacPaint was an innovative and groundbreaking piece of software. The source code has even been studied by software engineers as an example of how to properly write code. I also find it interesting is that it’s so small—a mere 5822 lines of Pascal and 3583 lines of assembler. For modern programmers, that’s just a drop in the bucket.