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  Service 07H (decimal 7) is, as we've already mentioned, the mirror image
  of service 06H. The difference between the two services is the scrolling
  action. In service 07H, the new blank lines appear at the top of the
  window and the old lines disappear at the bottom. The opposite scrolling
  action takes place in service 06H. See Figure 9-7 under service 06H for
  the register parameter settings.