If you actually look at Xerox’s hardware, it’s quite a stretch to call Lisa or Macintosh “less powerful.” It’s kind of amazing what Xerox was able to accomplish

If you actually look at Xerox’s hardware, it’s quite a stretch to call Lisa or Macintosh “less powerful.” It’s kind of amazing what Xerox was able to accomplish on such underpowered systems; they did it largely by having multitasking microcode to handle performance-sensitive I/O, and implementing BitBlt there too.