Re:Side Border Bitmap Scroller on the C64
by Someone on Monday December 05, 2022 @09:09AM
(#33865822)
https://en.wikipedia.org/wiki/Overscan: “Overscan is a behaviour in certain television sets, in which part of the input picture is shown outside of the visible bounds of the screen. It exists because cathode-ray tube (CRT) television sets from the 1930s through to the early 2000s were highly variable in how the video image was positioned within the borders of the screen. It then became common practice to have video signals with black edges around the picture, which the television was meant to discard in this way.”
Basically, you couldn’t trust two televisions to show a picture at the same size, or even a single television to show an image at constant size if it heated up.
Computer users would object if their screen chopped of some letters at the edge of their screens, so they had to accept the reverse: wasted space around the screen’s contents.
Basically, you couldn’t trust two televisions to show a picture at the same size, or even a single television to show an image at constant size if it heated up.
Computer users would object if their screen chopped of some letters at the edge of their screens, so they had to accept the reverse: wasted space around the screen’s contents.