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- {
- Here's an example of one of the possibilities mode-q offers. Of course the same
- can be done in any other mode, too... Well, just check it out. To Jens and the
- other carefull ones: keep being carefull (read the text).
- }
- {$define cpu386}
-
- program creditscroll;
- { Made by Bas van Gaalen, Holland, PD }
- uses
- crt,umodeq;
- const
- vseg:word=$a000; fseg=$f000; fofs=$fa6e; lines=45;
- txt:array[0..lines-1] of string[30]=(
- {.........|.........|.........|}
- 'This is a credits-scroll',
- 'in mode-q: 256x256x256.',
- 'That''s a chained mode, with',
- 'a lineair addressing sceme.',
- 'The graphics-screen is',
- 'initialized in the unit',
- 'umodeq. It''s enclosed in the',
- 'next message (I hope).','','',
- 'and so the credits go to','','',
- '...Bas van Gaalen...','','',
- 'Btw: this is quite lame:',
- 'not even a hardware-scroll!',
- 'But it''s just to show the',
- 'nice overscan-mode...','',
- 'Uuuhm, can someone supply',
- 'some shit, to fill up this',
- 'text?','',
- 'Oyeah, before I forget,',
- 'mode-q is a tweaked mode,',
- 'and it plays a bit with the',
- 'VGA-registers!',
- 'So again: I won''t take any',
- 'responsebilty for this code!',
- 'It works fine on my ET-4000.','','','',
- 'Gayle, place this in the SWAG',
- 'if you like...','','','','','','','','');
-
- procedure retrace; assembler; asm
- mov dx,3dah; @vert1: in al,dx; test al,8; jz @vert1
- @vert2: in al,dx; test al,8; jnz @vert2; end;
-
- procedure moveup; assembler; asm
- push ds; mov es,vseg; mov ds,vseg; xor di,di; mov si,0100h
- {$ifdef cpu386} mov cx,255*256/4; db $66; rep movsw
- {$else} mov cx,255*256/2; rep movsw {$endif} pop ds; end;
-
- var i,j,slidx,txtidx:byte;
- begin
- setmodeq;
- txtidx:=0; slidx:=0;
- repeat
- retrace;
- for i:=1 to length(txt[txtidx]) do for j:=0 to 7 do
- if ((mem[fseg:fofs+ord(txt[txtidx][i])*8+slidx] shl j) and 128)<>0 then
- mem[vseg:$fe00+i*8+(256-8*length(txt[txtidx])) div
- 2+j]:=32+txtidx+slidx+j; moveup;
- slidx:=(1+slidx) mod 8;
- if slidx=0 then txtidx:=(1+txtidx) mod lines;
- until keypressed;
- inittxt;
- end.