opcode op_20 = new opcode() { public void handler(){  /* JR   NZ,o		  */							
    	if((Z80.AF.L & ZF) ==0)
        {
            byte arg = (byte)ARG();/* ARG() also increments _PC */
            Z80.PC.SetD((Z80.PC.D + arg) & 0xFFFF);/* so don't do _PC += ARG() */
            z80_ICount[0] -= 5; 
            change_pc16(Z80.PC.D);
        }
        else
        {
            Z80.PC.AddD(1);//_PC++;
        }
    }}