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PC Underground
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UNDERGROUND.ISO
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copper.pas
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Pascal/Delphi Source File
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1995-08-01
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1KB
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28 lines
Uses Crt,ModeXLib;
var y1, {y-location Copper 1}
y1_dir, {y-direction Copper 1}
Mask:Word; {overlay mask, for overlaying the copper}
Procedure MakeCopper(y_pos1,y_pos2,overlay_mask:word);external;
{$l copper}
begin
TextMode(3); {Copper functions in EVERY video mode ! }
y1:=Port[$3da]; {switch ATC to Index-Mode}
Port[$3c0]:=$11 or 32; {select Register 11h}
Port[$3c0]:=255; {frame color 255}
y1:=0; {Start at upper screen border}
y1_dir:=2; {first movement down}
Mask:=$00ff; {first Copper 1 (red) in foreground}
Repeat
Inc(y1,y1_dir); {Copper-movement}
If (y1<=0) or (y1>=150) {at border : }
then Begin
y1_dir:=-y1_dir; {reverse direction}
Mask:=Swap(Mask); {each time a different copper in foreground}
End;
Write('T h i s i s d e m o t e x t ');
MakeCopper(y1,150-y1,Mask); {Draw copper}
Until KeyPressed;
End.