The first general purpose computer, known as ENIAC (Electronic Numerical Integrator And Computer – circa 1964), was heralded as the « Giant Brain. » It was literally larger than a dozen passenger buses and weighed about as much. It was made of tens of thousands of vacuum tubes and relays, hundreds of thousands of resistors and capacitors and millions of hand soldered joints. It operated at lightning speed, a whopping 0.1MHz. Skip forward 67 years, when the average computer is more than 10,000 times faster and one hundred thousand times smaller. Every computer since then has employed a system known as a « bus » for transferring signals and data both internally and to peripherals.