qa.hlp (Table of Contents; Topic list)
CWD
   Summary  Detail  Example  Key to Flags
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Convert Word to Double                           Flags:  O D I T S Z A P C
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Syntax:  CWD
 
  Converts the signed word in AX to a signed word in the DX:AX
  register pair by extending the sign bit of AX into all bits of DX.
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