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  Description:  Get or Set Break Flag
 
  Obtains or changes the status of the operating system's Break flag, which
  influences CTRL+C checking during function calls. Also returns the system
  boot drive in version 4.0.
 
  Input                                         Output
  ══════════════════════════════════            ══════════════════════════
  If getting Break flag                         DL=00H  Break flag is OFF
  AH=33H                                           01H  Break flag is ON
  AL=00H
  If setting Break flag
  AH=33H
  AL=01H
  DL=00H  if turning Break flag OFF
     01H  if turning Break flag ON
                                    -♦-