A correction to the code that I hope is actually a correction :).

for(int x=0;x<32;x++) {
int NTableByte = (nes.scanline/8)+x;
int PTablePtr = ((int)nes.PPUMem[0x2000+NTableByte]) * 16;
int Spec = nes.scanline%8;
byte b1 = nes.PPUMem[0x0000+PTablePtr+Spec];
byte b2 = nes.PPUMem[PTablePtr+8+Spec];
DrawTileLine(b1,b2,x);
}
nes.scanline++;