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A real time system is one whose correctness depends on

  • A.the timing of its results as well as their values
  • B.the speed of its processor relative to comparable machines
  • C.the absence of any operating system between application and hardware
  • D.the use of interrupts rather than polling for every input

Answer: A

Correct answer: the timing of its results as well as their values

A right answer delivered late is a wrong answer in a real time system, which is what distinguishes the field from ordinary computing. Nothing follows about the speed of the hardware or the presence of a kernel - a system with a deadline of a second is as real time as one with a deadline of a microsecond.

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