void PPU::raster_scanline() {
  if((status.ly >= 240 && status.ly <= 260)) {
    for(unsigned x = 0; x < 341; x++) tick();
    return scanline();
  }

  raster.oam_iterator = 0;
  raster.oam_counter = 0;

  for(unsigned n = 0; n < 8; n++) {
    raster.soam[n].id   = 64;
    raster.soam[n].y    = 0xff;
    raster.soam[n].tile = 0xff;
    raster.soam[n].attr = 0xff;
    raster.soam[n].x    = 0xff;
    raster.soam[n].tiledatalo = 0;
    raster.soam[n].tiledatahi = 0;
  }

  for(unsigned tile = 0; tile < 32; tile++) {  //  0-255
    unsigned nametable = chr_load(0x2000 | (status.vaddr & 0x0fff));
    unsigned tileaddr = status.bg_addr + (nametable << 4) + (scrolly() & 7);
    raster_pixel();
    tick();

    raster_pixel();
    tick();

    unsigned attribute = chr_load(0x23c0 | (status.vaddr & 0x0fc0) | ((scrolly() >> 5) << 3) | (scrollx() >> 5));
    if(scrolly() & 16) attribute >>= 4;
    if(scrollx() & 16) attribute >>= 2;
    raster_pixel();
    tick();

    scrollx_increment();
    if(tile == 31) scrolly_increment();
    raster_pixel();
    raster_sprite();
    tick();

    unsigned tiledatalo = chr_load(tileaddr + 0);
    raster_pixel();
    tick();

    raster_pixel();
    tick();

    unsigned tiledatahi = chr_load(tileaddr + 8);
    raster_pixel();
    tick();

    raster_pixel();
    raster_sprite();
    tick();

    raster.nametable = (raster.nametable << 8) | nametable;
    raster.attribute = (raster.attribute << 2) | (attribute & 3);
    raster.tiledatalo = (raster.tiledatalo << 8) | tiledatalo;
    raster.tiledatahi = (raster.tiledatahi << 8) | tiledatahi;
  }

  for(unsigned n = 0; n < 8; n++) raster.oam[n] = raster.soam[n];

  for(unsigned sprite = 0; sprite < 8; sprite++) {  //256-319
    unsigned nametable = chr_load(0x2000 | (status.vaddr & 0x0fff));
    tick();

    if(raster_enable() && sprite == 0) status.vaddr = (status.vaddr & 0x7be0) | (status.taddr & 0x041f);  //257
    tick();

    unsigned attribute = chr_load(0x23c0 | (status.vaddr & 0x0fc0) | ((scrolly() >> 5) << 3) | (scrollx() >> 5));
    unsigned tileaddr = (sprite_height() == 8)
    ? status.sprite_addr + raster.oam[sprite].tile * 16
    : ((raster.oam[sprite].tile & ~1) * 16) + ((raster.oam[sprite].tile & 1) * 0x1000);
    tick();
    tick();

    unsigned spritey = (status.ly - raster.oam[sprite].y) & (sprite_height() - 1);
    if(raster.oam[sprite].attr & 0x80) spritey ^= (sprite_height() - 1);
    tileaddr += spritey + (spritey & 8);

    raster.oam[sprite].tiledatalo = chr_load(tileaddr + 0);
    tick();
    tick();

    raster.oam[sprite].tiledatahi = chr_load(tileaddr + 8);
    tick();
    tick();

    if(raster_enable() && sprite == 6 && status.ly == 261) status.vaddr = status.taddr;  //304
  }

  for(unsigned tile = 0; tile < 2; tile++) {  //320-335
    unsigned nametable = chr_load(0x2000 | (status.vaddr & 0x0fff));
    unsigned tileaddr = status.bg_addr + (nametable << 4) + (scrolly() & 7);
    tick();
    tick();

    unsigned attribute = chr_load(0x23c0 | (status.vaddr & 0x0fc0) | ((scrolly() >> 5) << 3) | (scrollx() >> 5));
    if(scrolly() & 16) attribute >>= 4;
    if(scrollx() & 16) attribute >>= 2;
    tick();

    scrollx_increment();
    tick();

    unsigned tiledatalo = chr_load(tileaddr + 0);
    tick();
    tick();

    unsigned tiledatahi = chr_load(tileaddr + 8);
    tick();
    tick();

    raster.nametable = (raster.nametable << 8) | nametable;
    raster.attribute = (raster.attribute << 2) | (attribute & 3);
    raster.tiledatalo = (raster.tiledatalo << 8) | tiledatalo;
    raster.tiledatahi = (raster.tiledatahi << 8) | tiledatahi;
  }

  //336-339
  chr_load(0x2000 | (status.vaddr & 0x0fff));
  tick();
  bool skip = (raster_enable() && status.field == 1 && status.ly == 261);
  tick();

  chr_load(0x2000 | (status.vaddr & 0x0fff));
  tick();
  tick();

  //340
  if(skip == false) tick();

  return scanline();
}