README.md

pmm

Rascal--

A pascal-like low-level compiler to MOS6502 processors.

Write sexy Rascal programs directly for your c64. Compiles to dasm assembler.

Example program:

PROGRAM FirstC64;

VAR
 a, b, c, i, j,k,val,mainloop, idx, time,c2x, c2y,ax, ay : byte;
 x,y,scrollx,shiftx, shifty : byte;
 sprite0data: IncBin("sprite1.bin");
 charset: IncBin("test.bin","$1fff");
 fadeOut : array [8] of byte = ($00,$0d,$0b,$05,$02,$0a,$09,$0f,$04,$00,$0c,$06,$0e,$07,$08,$03 );
  fadeRedBlue : array [8] of byte = (00,$0f,$09,$0e,$02,$0c,$00,$0c,$09,$00,$02,$00,$0b,$05,$06,$0c); 

 siny : array[25] of byte; 
 sinx : array[40] of byte; 

 message: array[255] of byte;

 sprite_x : array[8] of byte;
 sprite_y : array[8] of byte;


  
procedure Plasma();
begin

  c2x:=ax;
  c2y:=ay;

  for x:=#0 to #25 do begin 
  	siny[x]:=  sine[c2x] + sine[c2y];

  	c2x:=c2x+#4;
  	c2y:=c2y+#9;
  end;

  ax:=ax+#3;
  ay:=ay-#5;

  	

  for x:=#0 to #40 do begin 
  	sinx[x] := sine[c2x] + sine[c2y];
  	c2x:=c2x+#6;
  	c2y:=c2y+#14;

  end;

  for y:=#9 to #23 do begin
  	moveto(#1,y, #$04);
  	peek(siny, y, val);
  	for x:=#1 to #19 do begin
  		k:=sinx[x] +val;

  	 	k:=k/#8;
  		c:=fadeRedBlue[k/#4];
  		k:=k+#64;

  		pokescreencolor(k,c,#0,#2);
/*			pokescreencolor(k,c,#1);*/
  		incscreenx(#2);

  	end;
  end;
  	
  

end;



procedure InitializeSprites();

begin
  poke(SPRITE_DATA_LOC,#0, #$0D); 
  poke(SPRITE_DATA_LOC,#1, #$0D);
  poke(SPRITE_BITMASK,#0, #%00000111);
  poke(SPRITE_COLOR,#0, WHITE);
  poke(SPRITE_COLOR,#1, YELLOW);
  memcpy(sprite0data, $0340, #63);

end;


procedure MoveSprite();
begin
  b:=time;
  poke(SPRITE_POS,#0, b);
  	poke(SPRITE_POS,#1, b);

end;


procedure PrintText(); 
begin
  MoveTo(#10, #24, #$04);
  printstring(message, #0);
  MoveTo(#17, #24, #$04);
  printnumber(time);

end;


begin
  moveto(#0,#0, #$04);
  message:="TIME";
  i:=#0;
  a:=#4;
  b:=#4;
  a:=b*#3;
  poke(SCREEN_BACKGROUND_COLOR, #0, a);

  poke(SCREEN_BACKGROUND_COLOR, #1, BLACK);
  poke(SCREEN_BACKGROUND_COLOR, #0, BLACK);
  poke($d018, #0, #$18);
  poke($C202, #0,#13);

  mainloop:=#1;
  time:=#0;


  ax:=#1;
  ay:=#5;
  fill($D800, GREEN,#0);
  fill($D900, GREEN,#0);
  fill($DA00, GREEN,#0);
  fill($DB00, GREEN,#0);
  asm("
  cli
  ");


  InitializeSprites();

  while mainloop<#10 do begin
  	time:=time+#1;
  	shiftx:=shiftx+#1;
  	shifty:=shifty+#3;

  	Plasma();
  	PrintText();
  	MoveSprite();
  end;

END.

To do:

• 16 bit operands
• 16 bit poke sprite location
• sid music
• IRQs
• user input
• create small shooter game