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After installing a sound card, the system locks up when a parallel port tape backup unit is also used. What is most likely the problem?

  • A.IRQ
  • B.DMA
  • C.defective LPT port
  • D.defective tape driver

Answer: A

Correct answer: IRQ

A sound card and a parallel port device that both want the same interrupt will each work alone and lock the machine when used together. That signature - two devices fine separately, fatal together - is an IRQ conflict.

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