public void pref11()
    {
        int ireg2 = ROP(m6809.pc) &0xFF;
        m6809.pc = m6809.pc + 1 & 0xFFFF;
    	switch( ireg2 )
    	{
    /*TODO*///		case 0x3f: swi3();		m6809_ICount[0]-=20;	break;
    /*TODO*///
    		case 0x83: cmpu_im();	m6809_ICount[0]-=5;	break;
    		case 0x8c: cmps_im();	m6809_ICount[0]-=5;	break;
    /*TODO*///
    		case 0x93: cmpu_di();	m6809_ICount[0]-=7;	break;
    /*TODO*///		case 0x9c: cmps_di();	m6809_ICount[0]-=7;	break;
    /*TODO*///
    		case 0xa3: cmpu_ix();	m6809_ICount[0]-=7;	break;
    /*TODO*///		case 0xac: cmps_ix();	m6809_ICount[0]-=7;	break;
    /*TODO*///
    		case 0xb3: cmpu_ex();	m6809_ICount[0]-=8;	break;
    /*TODO*///		case 0xbc: cmps_ex();	m6809_ICount[0]-=8;	break;
    /*TODO*///
    /*TODO*///		default:   illegal();						break;
             default:
                System.out.println("6809 prefix11 opcode 0x"+Integer.toHexString(ireg2));
    	}
    }