1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:

uses Windows;

...

procedure ClrScr;
var
 tc: tcoord;
 nw: Cardinal;
 cbi: TConsoleScreenBufferInfo;
begin
 getConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), cbi);
 tc.x := 0;
 tc.y := 0;
 FillConsoleOutputAttribute(GetStdHandle(STD_OUTPUT_HANDLE), 7, cbi.dwsize.x * cbi.dwsize.y, tc, nw);
 FillConsoleOutputCharacter(GetStdHandle(STD_OUTPUT_HANDLE), #32, cbi.dwsize.x * cbi.dwsize.y, tc, nw);
 setConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), tc);
end;