There a^([sic]) quite a lot of effects you can get with horz.retraces, eg a textmode copperbar (change color #0 with every scanline)
Source: wiktionary
Copperbar
Synonyms for "copperbar"
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Although most cards still support screen-tweaking, you can just forget about copperbars (writing within horizontal retrace fuks up the screen BADLY) and other effex. Same goes for changing the font.
Source: wiktionary
There was also the (really pretty famous) RSI Demomaker that let u make up your own intros/demos from a load of stock effects (bobs, starfields, copperbars, scrollers etc).. havent been able to find that tho...
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.