The phrase computer art scene or artscene for short refers to a community of individuals and groups who are interested and active in the creation of computer-based artwork.
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The demoscene is a computer sub-culture that came to prominence during the rise of the 16 bit micros (the Atari ST and the Amiga), but demos first appeared during the 8-bit era on computers such as C64 and ZX Spectrum.
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Demos began as software cracker's 'signatures'. When a cracked program was started, the cracker or his team would take credit via an increasingly impressive-looking graphical introduction called a "cracktro". The first time this appeared was on the Apple II computers in the late 1970s and early 1980s. Later, these intros evolved into their own subculture independent of cracking software. These were not initially called demos but rather letter, message, et cetera.
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<a href="http://en.wikipedia.org/wiki/Demoscene">Taken from Wikipedia</a>