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  Description:  Set Time
 
  Initializes the system real-time clock to a specified hour, minute,
  second, and hundredth of second. The system date is not affected.
 
  Input                                Output
  ═════════════════════════            ═══════════════════════════════════
  AH=2DH                               AL=00H  if time set successfully
  CH=hours (0 through 23)                 FFH  if time not valid (ignored)
  CL=minutes (0 through 59)
  DH=seconds (0 through 59)
  DL=hundredths of seconds
      (0 through 99)
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