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X-Hacker.org- Peter Norton Programmer's Guide - Norton Guide http://www.X-Hacker.org [<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide] 

  Devices that use service 90H to notify an operating system that they are
  busy can subsequently use service 91H (decimal 145) to signal that an
  input/output operation has been completed. The identification value passed
  in AL should be the same as the value passed in service 90H.
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