Imagine finding a wild horse stampeding across the surface of a computer chip. Well, we never imagined it---but here it is! This "American thoroughbred" mustang was discovered galloping around on a Hewlett-Packard PA-RISC 7000 microprocessor, flanked by the initials of the chips' designers. This processor was code named "Mustang" and was used in the HP 9000/720 series computers that were designed and built in the early 1990s. The initials JDY belong to Jeff Yetter, who was project manager for the chip, but did not actually add the doodle to the mask (Jeff says nobody remembers--or will reveal--who did).