@ -208,7 +208,7 @@ class AsciiIo.VT
when "n"
@reportRowAndColumn()
when "r" # Set top and bottom margins (scroll region on VT100)
@setScrollRegion n or 0, m or @lines - 1
@setScrollRegion n or 1, m or @lines
handlePrivateControlSequence: (data, params) ->
action = data[data.length - 1]