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  The clock generator supplies the multiphase clock signals that
  coordinate the microprocessor and the peripherals. The clock generator
  produces a high-frequency oscillating signal. For example, in the
  original IBM PC, this frequency was 14.31818 megahertz (MHz, or million
  cycles per second); in the newer machines, the frequency is higher.
  Other chips that require a regular timing signal obtain it from the
  system clock generator by dividing the base frequency by a constant to
  obtain the frequency they need to accomplish their tasks. For example,
  the IBM PC's 8088 is driven at 4.77 MHz, one-third of the base
  frequency. The PC's internal bus and the programmable interval timer
  (discussed shortly) use a frequency of 1.193 MHz, running at a quarter
  of the 8088 rate and one-twelfth of the base rate.