copperbar

plural copperbars

1. computingAn animated horizontal bar of colour that extends into the overscan area of the display.

   There a^([sic]) quite a lot of effects you can get with horz.retraces, eg a textmode copperbar (change color #0 with every scanline)

   1996, WolfMan^iNSaNiTY, “Which scanline???”, in comp.sys.ibm.pc.demos (Usenet)

   2 more examples

   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.

   1998, Paul-Jan Pauptit, “Raster trix are a problem nowadays.”, in comp.sys.ibm.pc.demos (Usenet)

   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...

   2000, Lando, “looking for software”, in alt.amiga.demos (Usenet)