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What is a TSR?

  • A.test status request
  • B.terminate and stay resident program
  • C.take status request
  • D.token set ready
  • E.token steady route

Answer: B

Correct answer: terminate and stay resident program

A TSR returns control to DOS but leaves its code in memory, normally with an interrupt vector pointing into it, so it can be re-entered by a hot key or by the hardware event it services. It was the only way to get background behaviour out of a single-tasking system.

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