void GZU_Write(int Addr,byte Value)
{
 byte *GZU_Ptr=GZU[scr_Page_Acces]+(Addr&0x3fff)*4;
 byte mask;

 int a0,a1,a2,c0,c1,c2;
// char md;

 a0=*(GZU_Ptr+0);
 a1=*(GZU_Ptr+1);
 a2=*(GZU_Ptr+2);

 LineUpdateFlag[(Addr&0x3fff)>>6]=1;

 if (NCREG & COLORMD) { //Color mode
   *(GZU_Ptr+0)=(*(GZU_Ptr+0) & ~Value) | ((NCREG & 2)?Value:0);
   *(GZU_Ptr+1)=(*(GZU_Ptr+1) & ~Value) | ((NCREG & 4)?Value:0);
   *(GZU_Ptr+2)=(*(GZU_Ptr+2) & ~Value) | ((NCREG & 8)?Value:0);

 } else { //Plane mode
   // WBIT !!!!!!!!!!!!!!!!!!!!!!!
   mask=(NCREG&WBIT)?Value:0;

   if (!(NCREG & ~WSEL0)) {
     *(GZU_Ptr+0)=(*(GZU_Ptr+0) & ~Value) | mask;
   }
   if (!(NCREG & ~WSEL1)) {
     *(GZU_Ptr+1)=(*(GZU_Ptr+1) & ~Value) | mask;
   }
   if (!(NCREG & ~WSEL2)) {
     *(GZU_Ptr+2)=(*(GZU_Ptr+2) & ~Value) | mask;
   }
 }

 c0=*(GZU_Ptr+0);
 c1=*(GZU_Ptr+1);
 c2=*(GZU_Ptr+2);
}

byte GZU_Read(int Addr)
{
 unsigned char *GZU_Ptr=GZU[scr_Page_Acces]+(Addr&0x3fff)*4;
 unsigned char Value=0;
 unsigned char C0;
 unsigned char C1;
 unsigned char C2;

 C0=*GZU_Ptr++;
 C1=*GZU_Ptr++;
 C2=*GZU_Ptr++;

 if (NCREG & COLORMD) { //Color mode

  if (!(NCREG & RSEL0)) C0^=0xff;
  if (!(NCREG & RSEL1)) C1^=0xff;
  if (!(NCREG & RSEL2)) C2^=0xff;
  Value=(C0&C1&C2)^0xff;

 } else { //Plane mode

  if (NCREG & RSEL0) Value|=C0;
  if (NCREG & RSEL1) Value|=C1;
  if (NCREG & RSEL2) Value|=C2;

 }

 return Value;
}