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Question: which direction ag setting causes index registers to move backward...

Question details
  1. Which Direction flag setting causes index registers to move backward through memory when executing string primitives?
  2. When a repeat prefix is used with STOSW, what value is added to or subtracted from the
    index register?
  3. In what way is the CMPS instruction ambiguous?
  4. When the Direction flag is clear and SCASB has found a matching character, where does
    EDI point?

Assembly language^

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