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A design needs 6 tasks with 512 B stacks, 2 kB of buffers and 1 kB for the kernel. The minimum RAM is about

  • A.9 kB
  • B.12 kB
  • C.6 kB
  • D.3 kB

Answer: C

Three kilobytes of stacks plus two of buffers plus one for the kernel is six, and a device with eight kilobytes leaves a sensible margin. Choosing the four kilobyte part to save a few pence would leave nothing for growth.

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