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  Function 54H (decimal 84) reports the current state of the verify flag,
  which controls whether or not DOS verifies disk-write operations. AL = 00H
  indicates that disk writes will not be verified; AL = 01H indicates that
  they will be. This function complements function 2EH, which sets or
  resets the verify flag.

  This function brings up an annoying inconsistency in DOS services: While
  some get/set service pairs are integrated into one function (like function
  57H), others are split into two separate functions, like function 54H and
  function 2EH.