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AH = 15h CL = row at which to start status area, or 00h to cancel CH = 00h
Return:
Nothing
Desc: Set a protected area of the screen which will not be affected by TTY writes or the scrolls they may generate
Notes: AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs. The current cursor position must be above the status area in order to set the protected area
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