overscan
Noun
Meaning
overscan (uncountable)
(television) The additional area around the four edges of a video image, outside of the safe area, that is not normally seen by the viewer.
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When connected to a normally-adjusted TV or monitor, the QL's video output would overscan horizontally.
This makes the display 320 or 640 pixels wide without overscan.
Vertical resolution, without overscan, is 200 pixels for an 60 Hz NTSC Amiga or 256 for a 50 Hz PAL Amiga.