1. 21.1. Using examples, explain why real-time systems usually have to be implemented using ­concurrent processes.

  2. 21.2. Identify possible stimuli and the expected responses for an embedded system that controls a home refrigerator or a domestic washing machine.

  3. 21.3. Using the state-based approach to modeling, as discussed in Section 21.1.1, model the ­operation of the embedded software for a voicemail system that is included in a landline phone.

    This should display the number of recorded messages on an LED display and should allow the user to dial-in and listen to the recorded messages.

  4. 21.4. Explain why an object-oriented approach to software development may not be suitable for real-time systems.

  5. 21.5. Show how the Environmental Control ...

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