NULL mag Issue 09 22 Fire demo textmod

eZine lover (@eZine)

Published in 

null magazine

 · 26 Dec 2020

this is a fire effect demo for text mode! compile it with turbo pascal 7 inside DOSBOX. remember to extract the FASTCRT unit, from this issue also, which is needed for the program to run.

the code is not mine, i found it in an old CDROM with various TP7 goodies i had and remember it again, while searching some old stuff.

the thing is, that after looking in the net, i found many more text mode demos, with AWESOME graphics and effects. i mean... it's unbelievable what those guys did in text mode, back then...

it's almost depressing that all these things (source code, demos) are lost in history and no one knows about them any more. very sad... :(

Program FireDemo; 
Uses fastcrt; 
Var 
   i,x,y : Integer; 
   FirePos : Array[1..80,1..50] of Byte; 
   FireDiv : Real; 
BEGIN { Main } 
   { Randomizing Š Fire routine :) } 
   Randomize; 

clrscr; 
asm 
  mov     ax, 1112h 
  xor     bl, bl 
  int     10h 
end; 

   { Changing palette colors } 
   For i := 1 to 5 do 
   Begin 
        Port[$3c8] := i; 
        Port[$3c9] := i*11; Port[$3c9] := i*3; Port[$3c9] := 0; 
   End; 
   For i := 6 to 12 do 
   Begin 
        Port[$3c8] := i; 
        Port[$3c9] := i*5; Port[$3c9] := i*5; Port[$3c9] := 0; 
   End; 

   { Calculating 1st 2 rows of the fire routine. } 

   { Start of Routine } 
   While not KeyPressed do 
   Begin { while loop } 
      wait_retrace; 
      For y := 49 to 50 do 
      Begin { y } 
            For x := 5 to 75 do FirePos[x,y] := Random(8) + 5; 
      End; 

      For y := 50 downto 10 do 
      Begin { y } 
            For x := 10 to 70 do 
            begin { x } 
                  i := Random(5) + 1; 
                  Case i of 
                       1: FirePos[x,y] := FirePos[x-1,y+1]; 
                       2: FirePos[x,y] := FirePos[x+1,y+1]; 
                       3: FirePos[x,y] := FirePos[x,y+1]; 
                       4: FirePos[x,y] := FirePos[x,y]; 
                       ELSE 
                       begin { else } 
                             FireDiv := Int((FirePos[x+1,y] + FirePos[x-1,y] + 
                              FirePos[x,y+1] ) / 3.1) ; 
                             FirePos[x,y] := Round(FireDiv); 
                       end; { else } 
                  end; { case } 
                  {Mem [$a000:x+(y*320)]:=FirePos[x,y];} 
                  fastout(x,y,chr(219),FirePos[x,y]); 
            end; { x } 
      end; { y } 
   End; { While loop } 

   { Set Text mode 3} 
   asm 
        mov     ax,0003h 
        int     10h 
   End; 

END. { Main }