/*
 * MUL* and MULU* do not set OV correctly
 * DIVX: the second operand should be treated as dword instead of word
 * GETATE, GETPTE and GETRA should not be used
 * UPDPSW: _CY and _OV must be cleared or unchanged? I suppose
 *   cleared, like TEST being done on the mask operand.
 * MOVT: I cannot understand exactly what happens to the result
 *   when an overflow occurs
 *
 * Unimplemented opcodes:
 * ROTC, UPDATE, UPDPTE
 */

static UINT32 f12Op1, f12Op2;
static UINT8 f12Flag1, f12Flag2;


/*
 *  Macro to access data in operands decoded with ReadAMAddress()
 */

#define F12LOADOPBYTE(num)			  \
	if (f12Flag##num)								\
		appb = (UINT8)v60.reg[f12Op##num];  \
	else														\
		appb = MemRead8(f12Op##num);

#define F12LOADOPHALF(num)			  \
	if (f12Flag##num)								\
		apph = (UINT16)v60.reg[f12Op##num];  \
	else														\
		apph = MemRead16(f12Op##num);

#define F12LOADOPWORD(num)			  \
	if (f12Flag##num)								\
		appw = v60.reg[f12Op##num];  \
	else														\
		appw = MemRead32(f12Op##num);

#define F12STOREOPBYTE(num)				\
	if (f12Flag##num)								\
		SETREG8(v60.reg[f12Op##num], appb);	\
	else														\
		MemWrite8(f12Op##num,appb);

#define F12STOREOPHALF(num)				\
	if (f12Flag##num)								\
		SETREG16(v60.reg[f12Op##num], apph);	\
	else														\
		MemWrite16(f12Op##num,apph);

#define F12STOREOPWORD(num)				\
	if (f12Flag##num)								\
		v60.reg[f12Op##num] = appw;	\
	else														\
		MemWrite32(f12Op##num,appw);

#define F12LOADOP1BYTE()  F12LOADOPBYTE(1)
#define F12LOADOP1HALF()  F12LOADOPHALF(1)
#define F12LOADOP1WORD()  F12LOADOPWORD(1)

#define F12LOADOP2BYTE()  F12LOADOPBYTE(2)
#define F12LOADOP2HALF()  F12LOADOPHALF(2)
#define F12LOADOP2WORD()  F12LOADOPWORD(2)

#define F12STOREOP1BYTE()  F12STOREOPBYTE(1)
#define F12STOREOP1HALF()  F12STOREOPHALF(1)
#define F12STOREOP1WORD()  F12STOREOPWORD(1)

#define F12STOREOP2BYTE()  F12STOREOPBYTE(2)
#define F12STOREOP2HALF()  F12STOREOPHALF(2)
#define F12STOREOP2WORD()  F12STOREOPWORD(2)



#define F12END()									\
	return amLength1 + amLength2 + 2;

static UINT8 if12;

// Decode the first operand of the instruction and prepare
// writing to the second operand.
static void F12DecodeFirstOperand(UINT32 (*DecodeOp1)(void), UINT8 dim1)
{
	if12 = OpRead8(PC + 1);

	// Check if F1 or F2
	if (if12 & 0x80)
	{
		modDim = dim1;
		modM = if12 & 0x40;
		modAdd = PC + 2;
		amLength1 = DecodeOp1();
		f12Op1 = amOut;
		f12Flag1 = amFlag;
	}
	else
	{
		// Check D flag
		if (if12 & 0x20)
		{
			modDim = dim1;
			modM = if12 & 0x40;
			modAdd = PC + 2;
			amLength1 = DecodeOp1();
			f12Op1 = amOut;
			f12Flag1 = amFlag;
		}
		else
		{
			if (DecodeOp1==ReadAM)
			{
				switch (dim1)
				{
				case 0:
					f12Op1 = (UINT8)v60.reg[if12 & 0x1F];
					break;
				case 1:
					f12Op1 = (UINT16)v60.reg[if12 & 0x1F];
					break;
				case 2:
					f12Op1 = v60.reg[if12 & 0x1F];
					break;
				}

				f12Flag1 = 0;
			}
			else
			{
				f12Flag1 = 1;
				f12Op1 = if12 & 0x1F;
			}

			amLength1 = 0;
		}
	}
}

static void F12WriteSecondOperand(UINT8 dim2)
{
	modDim = dim2;

	// Check if F1 or F2
	if (if12 & 0x80)
	{
		modM = if12 & 0x20;
		modAdd = PC + 2 + amLength1;
		modDim = dim2;
		amLength2 = WriteAM();
	}
	else
	{
		// Check D flag
		if (if12 & 0x20)
		{
			switch (dim2)
			{
			case 0:
				SETREG8(v60.reg[if12 & 0x1F], modWriteValB);
				break;
			case 1:
				SETREG16(v60.reg[if12 & 0x1F], modWriteValH);
				break;
			case 2:
				v60.reg[if12 & 0x1F] = modWriteValW;
				break;
			}

			amLength2 = 0;
		}
		else
		{
			modM = if12 & 0x40;
			modAdd = PC + 2;
			modDim = dim2;
			amLength2 = WriteAM();
		}
	}
}



// Decode both format 1/2 operands
static void F12DecodeOperands(UINT32 (*DecodeOp1)(void), UINT8 dim1, UINT32 (*DecodeOp2)(void), UINT8 dim2)
{
	UINT8 _if12 = OpRead8(PC + 1);

	// Check if F1 or F2
	if (_if12 & 0x80)
	{
		modDim = dim1;
		modM = _if12 & 0x40;
		modAdd = PC + 2;
		amLength1 = DecodeOp1();
		f12Op1 = amOut;
		f12Flag1 = amFlag;

		modDim = dim2;
		modM = _if12 & 0x20;
		modAdd = PC + 2 + amLength1;
		amLength2 = DecodeOp2();
		f12Op2 = amOut;
		f12Flag2 = amFlag;
	}
	else
	{
		// Check D flag
		if (_if12 & 0x20)
		{
			if (DecodeOp2==ReadAMAddress)
			{
				f12Op2 = _if12 & 0x1F;
				f12Flag2 = 1;
			}
			else
			{
				switch (dim2)
				{
				case 0:
					f12Op2 = (UINT8)v60.reg[_if12 & 0x1F];
					break;
				case 1:
					f12Op2 = (UINT16)v60.reg[_if12 & 0x1F];
					break;
				case 2:
					f12Op2 = v60.reg[_if12 & 0x1F];
					break;
				}
			}

			amLength2 = 0;

			modDim = dim1;
			modM = _if12 & 0x40;
			modAdd = PC + 2;
			amLength1 = DecodeOp1();
			f12Op1 = amOut;
			f12Flag1 = amFlag;
		}
		else
		{
			if (DecodeOp1==ReadAMAddress)
			{
				f12Op1 = _if12 & 0x1F;
				f12Flag1 = 1;
			}
			else
			{
				switch (dim1)
				{
				case 0:
					f12Op1 = (UINT8)v60.reg[_if12 & 0x1F];
					break;
				case 1:
					f12Op1 = (UINT16)v60.reg[_if12 & 0x1F];
					break;
				case 2:
					f12Op1 = v60.reg[_if12 & 0x1F];
					break;
				}
			}
			amLength1 = 0;

			modDim = dim2;
			modM = _if12 & 0x40;
			modAdd = PC + 2 + amLength1;
			amLength2 = DecodeOp2();
			f12Op2 = amOut;
			f12Flag2 = amFlag;
		}
	}
}

static UINT32 opADDB(void) /* TRUSTED (C too!)*/
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	ADDB(appb, (UINT8)f12Op1);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opADDH(void) /* TRUSTED (C too!)*/
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	ADDW(apph, (UINT16)f12Op1);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opADDW(void) /* TRUSTED (C too!) */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	ADDL(appw, (UINT32)f12Op1);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opADDCB(void)
{
	UINT8 appb, temp;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	temp = ((UINT8)f12Op1 + (_CY?1:0));
	ADDB(appb, temp);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opADDCH(void)
{
	UINT16 apph, temp;

	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	temp = ((UINT16)f12Op1 + (_CY?1:0));
	ADDW(apph, temp);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opADDCW(void)
{
	UINT32 appw, temp;

	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	temp = f12Op1 + (_CY?1:0);
	ADDL(appw, temp);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opANDB(void) /* TRUSTED */
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	appb &= f12Op1;
	_OV = 0;
	_S = ((appb&0x80)!=0);
	_Z = (appb==0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opANDH(void) /* TRUSTED */
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	apph &= f12Op1;
	_OV = 0;
	_S = ((apph&0x8000)!=0);
	_Z = (apph==0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opANDW(void) /* TRUSTED */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	appw &= f12Op1;
	_OV = 0;
	_S = ((appw&0x80000000)!=0);
	_Z = (appw==0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opCALL(void) /* TRUSTED */
{
	F12DecodeOperands(ReadAMAddress,0,ReadAMAddress,2);

	SP -= 4;
	MemWrite32(SP, AP);
	AP = f12Op2;

	SP -= 4;
	MemWrite32(SP, PC + amLength1 + amLength2 + 2);
	PC = f12Op1;
	ChangePC(PC);

	return 0;
}

static UINT32 opCHKAR(void)
{
	F12DecodeOperands(ReadAM,0,ReadAM,0);

	// No MMU and memory permissions yet @@@
	_Z = 1;
	_CY = 0;
	_S = 0;

	F12END();
}

static UINT32 opCHKAW(void)
{
	F12DecodeOperands(ReadAM,0,ReadAM,0);

	// No MMU and memory permissions yet @@@
	_Z = 1;
	_CY = 0;
	_S = 0;

	F12END();
}

static UINT32 opCHKAE(void)
{
	F12DecodeOperands(ReadAM,0,ReadAM,0);

	// No MMU and memory permissions yet @@@
	_Z = 1;
	_CY = 0;
	_S = 0;

	F12END();
}

static UINT32 opCHLVL(void)
{
	UINT32 oldPSW;

	F12DecodeOperands(ReadAM,0,ReadAM,0);

	if (f12Op1>3)
	{
		log_cb(RETRO_LOG_DEBUG, "Illegal data field on opCHLVL, PC=%x", PC);
	}

	oldPSW = v60_update_psw_for_exception(0, f12Op1);

	SP -= 4;
	MemWrite32(SP,f12Op2);

	SP -= 4;
	MemWrite32(SP,EXCEPTION_CODE_AND_SIZE(0x1800 + f12Op1*0x100, 8));

	SP -= 4;
	MemWrite32(SP,oldPSW);

	SP -= 4;
	MemWrite32(SP,PC + amLength1 + amLength2 + 2);

	PC = GETINTVECT(24+f12Op1);
	ChangePC(PC);

	return 0;
}

static UINT32 opCLR1(void) /* TRUSTED */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	_CY = ((appw & (1<<f12Op1))!=0);
	_Z = !(_CY);

	appw &= ~(1<<f12Op1);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opCMPB(void) /* TRUSTED (C too!) */
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAM,0);

	appb = (UINT8)f12Op2;
	SUBB(appb, (UINT8)f12Op1);

	F12END();
}

static UINT32 opCMPH(void) /* TRUSTED (C too!) */
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAM,1);

	apph = (UINT16)f12Op2;
	SUBW(apph, (UINT16)f12Op1);

	F12END();
}


static UINT32 opCMPW(void) /* TRUSTED (C too!)*/
{
	F12DecodeOperands(ReadAM,2,ReadAM,2);

	SUBL(f12Op2, (UINT32)f12Op1);

	F12END();
}

static UINT32 opDIVB(void) /* TRUSTED */
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	_OV = ((appb == 0x80) && (f12Op1==0xFF));
	if (f12Op1 && !_OV)
		appb= (INT8)appb / (INT8)f12Op1;
	_Z = (appb == 0);
	_S = ((appb & 0x80)!=0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opDIVH(void) /* TRUSTED */
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	_OV = ((apph == 0x8000) && (f12Op1==0xFFFF));
	if (f12Op1 && !_OV)
		apph = (INT16)apph / (INT16)f12Op1;
	_Z = (apph == 0);
	_S = ((apph & 0x8000)!=0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opDIVW(void) /* TRUSTED */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	_OV = ((appw == 0x80000000) && (f12Op1==0xFFFFFFFF));
	if (f12Op1 && !_OV)
		appw = (INT32)appw / (INT32)f12Op1;
	_Z = (appw == 0);
	_S = ((appw & 0x80000000)!=0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opDIVX(void)
{
	UINT32 a,b;
	INT64 dv;

	F12DecodeOperands(ReadAM,2,ReadAMAddress,3);

	if (f12Flag2)
	{
		a=v60.reg[f12Op2&0x1F];
		b=v60.reg[(f12Op2&0x1F)+1];
	}
	else
	{
		a=MemRead32(f12Op2);
		b=MemRead32(f12Op2+4);
	}

	dv = ((UINT64)b<<32) | ((UINT64)a);

	a = dv / (INT64)((INT32)f12Op1);
	b = dv % (INT64)((INT32)f12Op1);

	_S = ((a & 0x80000000)!=0);
	_Z = (a == 0);

	if (f12Flag2)
	{
		v60.reg[f12Op2&0x1F]=a;
		v60.reg[(f12Op2&0x1F)+1]=b;
	}
	else
	{
		MemWrite32(f12Op2,a);
		MemWrite32(f12Op2+4,b);
	}

	F12END();
}

static UINT32 opDIVUX(void)
{
	UINT32 a,b;
	UINT64 dv;

	F12DecodeOperands(ReadAM,2,ReadAMAddress,3);

	if (f12Flag2)
	{
		a=v60.reg[f12Op2&0x1F];
		b=v60.reg[(f12Op2&0x1F)+1];
	}
	else
	{
		a=MemRead32(f12Op2);
		b=MemRead32(f12Op2+4);
	}

	dv = (UINT64)(((UINT64)b<<32) | (UINT64)a);
	a = (UINT32)(dv / (UINT64)f12Op1);
	b = (UINT32)(dv % (UINT64)f12Op1);

	_S = ((a & 0x80000000) != 0);
	_Z = (a == 0);

	if (f12Flag2)
	{
		v60.reg[f12Op2&0x1F]=a;
		v60.reg[(f12Op2&0x1F)+1]=b;
	}
	else
	{
		MemWrite32(f12Op2,a);
		MemWrite32(f12Op2+4,b);
	}

	F12END();
}


static UINT32 opDIVUB(void) /* TRUSTED */
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	_OV = 0;
	if (f12Op1)	appb /= (UINT8)f12Op1;
	_Z = (appb == 0);
	_S = ((appb & 0x80)!=0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opDIVUH(void) /* TRUSTED */
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	_OV = 0;
	if (f12Op1)	apph /= (UINT16)f12Op1;
	_Z = (apph == 0);
	_S = ((apph & 0x8000)!=0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opDIVUW(void) /* TRUSTED */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	_OV = 0;
	if (f12Op1)	appw /= f12Op1;
	_Z = (appw == 0);
	_S = ((appw & 0x80000000)!=0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opINB(void)
{
	F12DecodeFirstOperand(ReadAMAddress,0);
	modWriteValB=PortRead8(f12Op1);

	if ( v60_stall_io )
	{
		v60_stall_io = 0;
		return 0;
	}

	F12WriteSecondOperand(0);
	F12END();
}

static UINT32 opINH(void)
{
	F12DecodeFirstOperand(ReadAMAddress,1);
	modWriteValH=PortRead16(f12Op1);

	if ( v60_stall_io )
	{
		v60_stall_io = 0;
		return 0;
	}

	F12WriteSecondOperand(1);
	F12END();
}

static UINT32 opINW(void)
{
	F12DecodeFirstOperand(ReadAMAddress,2);
	modWriteValW=PortRead32(f12Op1);

	if ( v60_stall_io )
	{
		v60_stall_io = 0;
		return 0;
	}

	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opLDPR(void)
{
	F12DecodeOperands(ReadAMAddress,2,ReadAM,2);
	if (f12Op2 >= 0 && f12Op2 <= 28)
	{
	  if (f12Flag1 &&(!(OpRead8(PC + 1)&0x80 && OpRead8(PC + 2)==0xf4 ) ))
			v60.reg[f12Op2 + 36] = v60.reg[f12Op1];
		else
			v60.reg[f12Op2 + 36] = f12Op1;
	}
	else
	{
		log_cb(RETRO_LOG_DEBUG, "Invalid operand on LDPR PC=%x", PC);
	}
	F12END();
}

static UINT32 opLDTASK(void)
{
	int i;
	F12DecodeOperands(ReadAMAddress,2,ReadAM,2);

	v60WritePSW(v60ReadPSW() & 0xefffffff);

	TR = f12Op2;

	TKCW = MemRead32(f12Op2);
	f12Op2 += 4;
	if(SYCW & 0x100) {
		L0SP = MemRead32(f12Op2);
		f12Op2 += 4;
	}
	if(SYCW & 0x200) {
		L1SP = MemRead32(f12Op2);
		f12Op2 += 4;
	}
	if(SYCW & 0x400) {
		L2SP = MemRead32(f12Op2);
		f12Op2 += 4;
	}
	if(SYCW & 0x800) {
		L3SP = MemRead32(f12Op2);
		f12Op2 += 4;
	}

	v60ReloadStack();

	// 31 registers supported, _not_ 32
	for(i=0; i<31; i++)
		if(f12Op1 & (1<<i)) {
			v60.reg[i] = MemRead32(f12Op2);
			f12Op2 += 4;
		}

	// #### Ignore the virtual addressing crap.

	F12END();
}

static UINT32 opMOVD(void) /* TRUSTED */
{
	UINT32 a,b;

	F12DecodeOperands(ReadAMAddress,3,ReadAMAddress,3);

	if (f12Flag1)
	{
		a=v60.reg[f12Op1&0x1F];
		b=v60.reg[(f12Op1&0x1F)+1];
	}
	else
	{
		a=MemRead32(f12Op1);
		b=MemRead32(f12Op1+4);
	}

	if (f12Flag2)
	{
		v60.reg[f12Op2&0x1F]=a;
		v60.reg[(f12Op2&0x1F)+1]=b;
	}
	else
	{
		MemWrite32(f12Op2,a);
		MemWrite32(f12Op2+4,b);
	}

	F12END();
}

static UINT32 opMOVB(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,0);
	modWriteValB = (UINT8)f12Op1;
	F12WriteSecondOperand(0);
	F12END();
}

static UINT32 opMOVH(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,1);
	modWriteValH = (UINT16)f12Op1;
	F12WriteSecondOperand(1);
	F12END();
}

static UINT32 opMOVW(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,2);
	modWriteValW = f12Op1;
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMOVEAB(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAMAddress,0);
	modWriteValW = f12Op1;
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMOVEAH(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAMAddress,1);
	modWriteValW = f12Op1;
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMOVEAW(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAMAddress,2);
	modWriteValW = f12Op1;
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMOVSBH(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,0);
	modWriteValH = (INT8)(f12Op1&0xFF);
	F12WriteSecondOperand(1);
	F12END();
}

static UINT32 opMOVSBW(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,0);
	modWriteValW = (INT8)(f12Op1&0xFF);
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMOVSHW(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,1);
	modWriteValW = (INT16)(f12Op1&0xFFFF);
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMOVTHB(void)
{
	F12DecodeFirstOperand(ReadAM,1);
	modWriteValB = (UINT8)(f12Op1&0xFF);

	// Check for overflow: the truncated bits must match the sign
	//  of the result, otherwise overflow
	if (((modWriteValB&0x80)==0x80 && ((f12Op1&0xFF00)==0xFF00)) ||
		  ((modWriteValB&0x80)==0 && ((f12Op1&0xFF00)==0x0000)))
		_OV = 0;
	else
		_OV = 1;

	F12WriteSecondOperand(0);
	F12END();
}

static UINT32 opMOVTWB(void)
{
	F12DecodeFirstOperand(ReadAM,2);
	modWriteValB = (UINT8)(f12Op1&0xFF);

	// Check for overflow: the truncated bits must match the sign
	//  of the result, otherwise overflow
	if (((modWriteValB&0x80)==0x80 && ((f12Op1&0xFFFFFF00)==0xFFFFFF00)) ||
		  ((modWriteValB&0x80)==0 && ((f12Op1&0xFFFFFF00)==0x00000000)))
		_OV = 0;
	else
		_OV = 1;

	F12WriteSecondOperand(0);
	F12END();
}

static UINT32 opMOVTWH(void)
{
	F12DecodeFirstOperand(ReadAM,2);
	modWriteValH = (UINT16)(f12Op1&0xFFFF);

	// Check for overflow: the truncated bits must match the sign
	//  of the result, otherwise overflow
	if (((modWriteValH&0x8000)==0x8000 && ((f12Op1&0xFFFF0000)==0xFFFF0000)) ||
		  ((modWriteValH&0x8000)==0 && ((f12Op1&0xFFFF0000)==0x00000000)))
		_OV = 0;
	else
		_OV = 1;

	F12WriteSecondOperand(1);
	F12END();
}


static UINT32 opMOVZBH(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,0);
	modWriteValH = (UINT16)f12Op1;
	F12WriteSecondOperand(1);
	F12END();
}

static UINT32 opMOVZBW(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,0);
	modWriteValW = f12Op1;
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMOVZHW(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,1);
	modWriteValW = f12Op1;
	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opMULB(void)
{
	UINT8 appb;
	UINT32 tmp;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	// @@@ OV not set!!
	tmp=(INT8)appb * (INT32)(INT8)f12Op1;
	appb = tmp;
	_Z = (appb == 0);
	_S = ((appb & 0x80)!=0);
	_OV = ((tmp >> 8)!=0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opMULH(void)
{
	UINT16 apph;
	UINT32 tmp;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	// @@@ OV not set!!
	tmp=(INT16)apph * (INT32)(INT16)f12Op1;
	apph = tmp;
	_Z = (apph == 0);
	_S = ((apph & 0x8000)!=0);
	_OV = ((tmp >> 16)!=0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opMULW(void)
{
	UINT32 appw;
	UINT64 tmp;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	// @@@ OV not set!!
	tmp=(INT32)appw * (INT64)(INT32)f12Op1;
	appw = tmp;
	_Z = (appw == 0);
	_S = ((appw & 0x80000000)!=0);
	_OV = ((tmp >> 32) != 0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opMULUB(void)
{
	UINT8 appb;
	UINT32 tmp;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	// @@@ OV not set!!
	tmp = appb * (UINT8)f12Op1;
	appb = tmp;
	_Z = (appb == 0);
	_S = ((appb & 0x80)!=0);
	_OV = ((tmp >> 8)!=0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opMULUH(void)
{
	UINT16 apph;
	UINT32 tmp;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	// @@@ OV not set!!
	tmp=apph * (UINT16)f12Op1;
	apph = tmp;
	_Z = (apph == 0);
	_S = ((apph & 0x8000)!=0);
	_OV = ((tmp >> 16)!=0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opMULUW(void)
{
	UINT32 appw;
	UINT64 tmp;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	// @@@ OV not set!!
	tmp=(UINT64)appw * (UINT64)f12Op1;
	appw = tmp;
	_Z = (appw == 0);
	_S = ((appw & 0x80000000)!=0);
	_OV = ((tmp >> 32)!=0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opNEGB(void) /* TRUSTED  (C too!)*/
{
	F12DecodeFirstOperand(ReadAM,0);

	modWriteValB = 0;
	SUBB(modWriteValB, (INT8)f12Op1);

	F12WriteSecondOperand(0);
	F12END();
}

static UINT32 opNEGH(void) /* TRUSTED  (C too!)*/
{
	F12DecodeFirstOperand(ReadAM,1);

	modWriteValH = 0;
	SUBW(modWriteValH, (INT16)f12Op1);

	F12WriteSecondOperand(1);
	F12END();
}

static UINT32 opNEGW(void) /* TRUSTED  (C too!)*/
{
	F12DecodeFirstOperand(ReadAM,2);

	modWriteValW = 0;
	SUBL(modWriteValW, (INT32)f12Op1);

	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opNOTB(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,0);
	modWriteValB=~f12Op1;

	_OV=0;
	_S=((modWriteValB&0x80)!=0);
	_Z=(modWriteValB==0);

	F12WriteSecondOperand(0);
	F12END();
}

static UINT32 opNOTH(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,1);
	modWriteValH=~f12Op1;

	_OV=0;
	_S=((modWriteValH&0x8000)!=0);
	_Z=(modWriteValH==0);

	F12WriteSecondOperand(1);
	F12END();
}

static UINT32 opNOTW(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,2);
	modWriteValW=~f12Op1;

	_OV=0;
	_S=((modWriteValW&0x80000000)!=0);
	_Z=(modWriteValW==0);

	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opNOT1(void) /* TRUSTED */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	_CY = ((appw & (1<<f12Op1))!=0);
	_Z = !(_CY);

	if (_CY)
		appw &= ~(1<<f12Op1);
	else
		appw |= (1<<f12Op1);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opORB(void) /* TRUSTED  (C too!)*/
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	ORB(appb, (UINT8)f12Op1);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opORH(void) /* TRUSTED (C too!)*/
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	ORW(apph, (UINT16)f12Op1);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opORW(void) /* TRUSTED (C too!) */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	ORL(appw, (UINT32)f12Op1);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opOUTB(void)
{
	F12DecodeOperands(ReadAM,0,ReadAMAddress,2);
	PortWrite8(f12Op2,(UINT8)f12Op1);
	F12END();
}

static UINT32 opOUTH(void)
{
	F12DecodeOperands(ReadAM,1,ReadAMAddress,2);
	PortWrite16(f12Op2,(UINT16)f12Op1);
	F12END();
}

static UINT32 opOUTW(void)
{
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);
	PortWrite32(f12Op2,f12Op1);
	F12END();
}

static UINT32 opREMB(void)
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	_OV = 0;
	if (f12Op1)
		appb= (INT8)appb % (INT8)f12Op1;
	_Z = (appb == 0);
	_S = ((appb & 0x80)!=0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opREMH(void)
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	_OV = 0;
	if (f12Op1)
		apph=(INT16)apph % (INT16)f12Op1;
	_Z = (apph == 0);
	_S = ((apph & 0x8000)!=0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opREMW(void)
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	_OV = 0;
	if (f12Op1)
		appw=(INT32)appw % (INT32)f12Op1;
	_Z = (appw == 0);
	_S = ((appw & 0x80000000)!=0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opREMUB(void)
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	_OV = 0;
	if (f12Op1)
		appb %= (UINT8)f12Op1;
	_Z = (appb == 0);
	_S = ((appb & 0x80)!=0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opREMUH(void)
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	_OV = 0;
	if (f12Op1)
		apph %= (UINT16)f12Op1;
	_Z = (apph == 0);
	_S = ((apph & 0x8000)!=0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opREMUW(void)
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	_OV = 0;
	if (f12Op1)
		appw %= f12Op1;
	_Z = (appw == 0);
	_S = ((appw & 0x80000000)!=0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opROTB(void) /* TRUSTED */
{
	UINT8 appb;
	INT8 i,count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		for (i=0;i<count;i++)
			appb = (appb<<1) | ((appb&0x80) >> 7);

		_CY=(appb&0x1)!=0;
	}
	else if (count<0)
	{
		count=-count;
		for (i=0;i<count;i++)
			appb = (appb>>1) | ((appb&0x1) << 7);

		_CY=(appb&0x80)!=0;
	}
	else
		_CY=0;

	_OV=0;
	_S=(appb&0x80)!=0;
	_Z=(appb==0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opROTH(void) /* TRUSTED */
{
	UINT16 apph;
	INT8 i,count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,1);

	F12LOADOP2HALF();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		for (i=0;i<count;i++)
			apph = (apph<<1) | ((apph&0x8000) >> 15);

		_CY=(apph&0x1)!=0;
	}
	else if (count<0)
	{
		count=-count;
		for (i=0;i<count;i++)
			apph = (apph>>1) | ((apph&0x1) << 15);

		_CY=(apph&0x8000)!=0;
	}
	else
		_CY=0;

	_OV=0;
	_S=(apph&0x8000)!=0;
	_Z=(apph==0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opROTW(void) /* TRUSTED */
{
	UINT32 appw;
	INT8 i,count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,2);

	F12LOADOP2WORD();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		for (i=0;i<count;i++)
			appw = (appw<<1) | ((appw&0x80000000) >> 31);

		_CY=(appw&0x1)!=0;
	}
	else if (count<0)
	{
		count=-count;
		for (i=0;i<count;i++)
			appw = (appw>>1) | ((appw&0x1) << 31);

		_CY=(appw&0x80000000)!=0;
	}
	else
		_CY=0;

	_OV=0;
	_S=(appw&0x80000000)!=0;
	_Z=(appw==0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opROTCB(void) /* TRUSTED */
{
	UINT8 appb;
	INT8 i,cy,count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();
	NORMALIZEFLAGS();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		for (i=0;i<count;i++)
		{
			cy = _CY;
			_CY = (UINT8)((appb & 0x80) >> 7);
			appb = (appb<<1) | cy;
		}
	}
	else if (count<0)
	{
		count=-count;
		for (i=0;i<count;i++)
		{
			cy = _CY;
			_CY = (appb & 1);
			appb = (appb>>1) | (cy << 7);
		}
	}
	else
		_CY = 0;

	_OV=0;
	_S=(appb&0x80)!=0;
	_Z=(appb==0);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opROTCH(void) /* TRUSTED */
{
	UINT16 apph;
	INT8 i,cy,count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,1);

	F12LOADOP2HALF();
	NORMALIZEFLAGS();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		for (i=0;i<count;i++)
		{
			cy = _CY;
			_CY = (UINT8)((apph & 0x8000) >> 15);
			apph = (apph<<1) | cy;
		}
	}
	else if (count<0)
	{
		count=-count;
		for (i=0;i<count;i++)
		{
			cy = _CY;
			_CY = (UINT8)(apph & 1);
			apph = (apph>>1) | ((UINT16)cy << 15);
		}
	}
	else
		_CY = 0;

	_OV=0;
	_S=(apph&0x8000)!=0;
	_Z=(apph==0);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opROTCW(void) /* TRUSTED */
{
	UINT32 appw;
	INT8 i,cy,count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,2);

	F12LOADOP2WORD();
	NORMALIZEFLAGS();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		for (i=0;i<count;i++)
		{
			cy = _CY;
			_CY = (UINT8)((appw & 0x80000000) >> 31);
			appw = (appw<<1) | cy;
		}
	}
	else if (count<0)
	{
		count=-count;
		for (i=0;i<count;i++)
		{
			cy = _CY;
			_CY = (UINT8)(appw & 1);
			appw = (appw>>1) | ((UINT32)cy << 31);
		}
	}
	else
		_CY=0;

	_OV=0;
	_S=(appw&0x80000000)!=0;
	_Z=(appw==0);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opRVBIT(void)
{
	F12DecodeFirstOperand(ReadAM,0);

	modWriteValB =(UINT8)
								(((f12Op1 & (1<<0)) << 7) |
								 ((f12Op1 & (1<<1)) << 5) |
								 ((f12Op1 & (1<<2)) << 3) |
								 ((f12Op1 & (1<<3)) << 1) |
								 ((f12Op1 & (1<<4)) >> 1) |
								 ((f12Op1 & (1<<5)) >> 3) |
								 ((f12Op1 & (1<<6)) >> 5) |
								 ((f12Op1 & (1<<7)) >> 7));

	F12WriteSecondOperand(0);
	F12END();
}

static UINT32 opRVBYT(void) /* TRUSTED */
{
	F12DecodeFirstOperand(ReadAM,2);

	modWriteValW = ((f12Op1 & 0x000000FF) << 24) |
								 ((f12Op1 & 0x0000FF00) << 8)  |
								 ((f12Op1 & 0x00FF0000) >> 8)  |
								 ((f12Op1 & 0xFF000000) >> 24);

	F12WriteSecondOperand(2);
	F12END();
}

static UINT32 opSET1(void) /* TRUSTED */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	_CY = ((appw & (1<<f12Op1))!=0);
	_Z = !(_CY);

	appw |= (1<<f12Op1);

	F12STOREOP2WORD();
	F12END();
}


static UINT32 opSETF(void)
{
	F12DecodeFirstOperand(ReadAM,0);

	// Normalize the flags
	NORMALIZEFLAGS();

	switch (f12Op1 & 0xF)
	{
	case 0:
		if (!_OV) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 1:
		if (_OV) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 2:
		if (!_CY) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 3:
		if (_CY) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 4:
		if (!_Z) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 5:
		if (_Z) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 6:
		if (!(_CY | _Z)) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 7:
		if ((_CY | _Z)) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 8:
		if (!_S) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 9:
		if (_S) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 10:
		modWriteValB=1;
		break;
	case 11:
		modWriteValB=0;
		break;
	case 12:
		if (!(_S^_OV)) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 13:
		if ((_S^_OV)) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 14:
		if (!((_S^_OV)|_Z)) modWriteValB=0;
		else modWriteValB=1;
		break;
	case 15:
		if (((_S^_OV)|_Z)) modWriteValB=0;
		else modWriteValB=1;
		break;
	}

	F12WriteSecondOperand(0);

	F12END();
}

/*
#define SHIFTLEFT_OY(val, count, bitsize) \
{\
    UINT32 tmp = ((val) >> (bitsize-1)) & 1; \
    tmp <<= count; \
    tmp -= 1; \
    tmp <<= (bitsize - (count)); \
    _OV = (((val) & tmp) != tmp); \
    _CY = (((val) & (1 << (count-1))) != 0); \
}
*/

// During the shift, the overflow is set if the sign bit changes at any point during the shift
#define SHIFTLEFT_OV(val, count, bitsize) \
{\
	UINT32 tmp; \
	if (count == 32) \
		tmp = 0xFFFFFFFF; \
	else \
		tmp = ((1 << (count)) - 1); \
	tmp <<= (bitsize - (count)); \
	if (((val) >> (bitsize-1)) & 1) \
		_OV = (((val) & tmp) != tmp); \
	else \
		_OV = (((val) & tmp) != 0); \
}

#define SHIFTLEFT_CY(val, count, bitsize) \
	_CY = (UINT8)(((val) >> (bitsize - count)) & 1);



#define SHIFTARITHMETICRIGHT_OV(val, count, bitsize) \
	_OV = 0;

#define SHIFTARITHMETICRIGHT_CY(val, count, bitsize) \
	_CY = (UINT8)(((val) >> (count-1)) & 1);



static UINT32 opSHAB(void)
{
	UINT8 appb;
	INT8 count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	count=(INT8)(f12Op1&0xFF);

	// Special case: destination unchanged, flags set
	if (count == 0)
	{
		_CY = _OV = 0;
		SetSZPF_Byte(appb);
	}
	else if (count>0)
	{
		SHIFTLEFT_OV(appb, count, 8);

		// @@@ Undefined what happens to CY when count >= bitsize
		SHIFTLEFT_CY(appb, count, 8);

		// do the actual shift...
		if (count >= 8)
			appb = 0;
		else
			appb <<= count;

		// and set zero and sign
		SetSZPF_Byte(appb);
	}
	else
	{
		count = -count;

		SHIFTARITHMETICRIGHT_OV(appb, count, 8);
		SHIFTARITHMETICRIGHT_CY(appb, count, 8);

		if (count >= 8)
			appb = (appb & 0x80) ? 0xFF : 0;
		else
			appb = ((INT8)appb) >> count;

		SetSZPF_Byte(appb);
	}

//  mame_printf_debug("SHAB: %x _CY: %d _Z: %d _OV: %d _S: %d\n", appb, _CY, _Z, _OV, _S);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opSHAH(void)
{
	UINT16 apph;
	INT8 count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,1);

	F12LOADOP2HALF();

	count=(INT8)(f12Op1&0xFF);

	// Special case: destination unchanged, flags set
	if (count == 0)
	{
		_CY = _OV = 0;
		SetSZPF_Word(apph);
	}
	else if (count>0)
	{
		SHIFTLEFT_OV(apph, count, 16);

		// @@@ Undefined what happens to CY when count >= bitsize
		SHIFTLEFT_CY(apph, count, 16);

		// do the actual shift...
		if (count >= 16)
			apph = 0;
		else
			apph <<= count;

		// and set zero and sign
		SetSZPF_Word(apph);
	}
	else
	{
		count = -count;

		SHIFTARITHMETICRIGHT_OV(apph, count, 16);
		SHIFTARITHMETICRIGHT_CY(apph, count, 16);

		if (count >= 16)
			apph = (apph & 0x8000) ? 0xFFFF : 0;
		else
			apph = ((INT16)apph) >> count;

		SetSZPF_Word(apph);
	}

//  mame_printf_debug("SHAH: %x >> %d = %x _CY: %d _Z: %d _OV: %d _S: %d\n", oldval, count, apph, _CY, _Z, _OV, _S);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opSHAW(void)
{
	UINT32 appw;
	INT8 count;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,2);

	F12LOADOP2WORD();

	count=(INT8)(f12Op1&0xFF);

	// Special case: destination unchanged, flags set
	if (count == 0)
	{
		_CY = _OV = 0;
		SetSZPF_Long(appw);
	}
	else if (count>0)
	{
		SHIFTLEFT_OV(appw, count, 32);

		// @@@ Undefined what happens to CY when count >= bitsize
		SHIFTLEFT_CY(appw, count, 32);

		// do the actual shift...
		if (count >= 32)
			appw = 0;
		else
			appw <<= count;

		// and set zero and sign
		SetSZPF_Long(appw);
	}
	else
	{
		count = -count;

		SHIFTARITHMETICRIGHT_OV(appw, count, 32);
		SHIFTARITHMETICRIGHT_CY(appw, count, 32);

		if (count >= 32)
			appw = (appw & 0x80000000) ? 0xFFFFFFFF : 0;
		else
			appw = ((INT32)appw) >> count;

		SetSZPF_Long(appw);
	}

//  mame_printf_debug("SHAW: %x >> %d = %x _CY: %d _Z: %d _OV: %d _S: %d\n", oldval, count, appw, _CY, _Z, _OV, _S);

	F12STOREOP2WORD();
	F12END();
}


static UINT32 opSHLB(void) /* TRUSTED */
{
	UINT8 appb;
	INT8 count;
	UINT32 tmp;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		// left shift flags:
		// carry gets the last bit shifted out,
		// overflow is always CLEARed

		_OV = 0;	// default to no overflow

		// now handle carry
		tmp = appb & 0xff;
		tmp <<= count;
		SetCFB(tmp);	// set carry properly

		// do the actual shift...
		appb <<= count;

		// and set zero and sign
		SetSZPF_Byte(appb);
	}
	else
	{
		if (count == 0)
		{
			// special case: clear carry and overflow, do nothing else
			_CY = _OV = 0;
			SetSZPF_Byte(appb);	// doc. is unclear if this is true...
		}
		else
		{
			// right shift flags:
			// carry = last bit shifted out
			// overflow always cleared
			tmp = appb & 0xff;
			tmp >>= ((-count)-1);
			_CY = (UINT8)(tmp & 0x1);
			_OV = 0;

			appb >>= -count;
			SetSZPF_Byte(appb);
		}
	}

//  mame_printf_debug("SHLB: %x _CY: %d _Z: %d _OV: %d _S: %d\n", appb, _CY, _Z, _OV, _S);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opSHLH(void) /* TRUSTED */
{
	UINT16 apph;
	INT8 count;
	UINT32 tmp;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,1);

	F12LOADOP2HALF();

	count=(INT8)(f12Op1&0xFF);
//  mame_printf_debug("apph: %x count: %d  ", apph, count);
	if (count>0)
	{
		// left shift flags:
		// carry gets the last bit shifted out,
		// overflow is always CLEARed

		_OV = 0;

		// now handle carry
		tmp = apph & 0xffff;
		tmp <<= count;
		SetCFW(tmp);	// set carry properly

		// do the actual shift...
		apph <<= count;

		// and set zero and sign
		SetSZPF_Word(apph);
	}
	else
	{
		if (count == 0)
		{
			// special case: clear carry and overflow, do nothing else
			_CY = _OV = 0;
			SetSZPF_Word(apph);	// doc. is unclear if this is true...
		}
		else
		{
			// right shift flags:
			// carry = last bit shifted out
			// overflow always cleared
			tmp = apph & 0xffff;
			tmp >>= ((-count)-1);
			_CY = (UINT8)(tmp & 0x1);
			_OV = 0;

			apph >>= -count;
			SetSZPF_Word(apph);
		}
	}

//  mame_printf_debug("SHLH: %x _CY: %d _Z: %d _OV: %d _S: %d\n", apph, _CY, _Z, _OV, _S);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opSHLW(void) /* TRUSTED */
{
	UINT32 appw;
	INT8 count;
	UINT64 tmp;

	F12DecodeOperands(ReadAM,0,ReadAMAddress,2);

	F12LOADOP2WORD();

	count=(INT8)(f12Op1&0xFF);
	if (count>0)
	{
		// left shift flags:
		// carry gets the last bit shifted out,
		// overflow is always CLEARed

		_OV = 0;

		// now handle carry
		tmp = appw & 0xffffffff;
		tmp <<= count;
		SetCFL(tmp);	// set carry properly

		// do the actual shift...
		appw <<= count;

		// and set zero and sign
		SetSZPF_Long(appw);
	}
	else
	{
		if (count == 0)
		{
			// special case: clear carry and overflow, do nothing else
			_CY = _OV = 0;
			SetSZPF_Long(appw);	// doc. is unclear if this is true...
		}
		else
		{
			// right shift flags:
			// carry = last bit shifted out
			// overflow always cleared
			tmp = (UINT64)(appw & 0xffffffff);
			tmp >>= ((-count)-1);
			_CY = (UINT8)(tmp & 0x1);
			_OV = 0;

			appw >>= -count;
			SetSZPF_Long(appw);
		}
	}

//  mame_printf_debug("SHLW: %x _CY: %d _Z: %d _OV: %d _S: %d\n", appw, _CY, _Z, _OV, _S);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opSTPR(void)
{
	F12DecodeFirstOperand(ReadAM,2);
	if (f12Op1 >= 0 && f12Op1 <= 28)
		modWriteValW = v60.reg[f12Op1 + 36];
	else
	{
		log_cb(RETRO_LOG_DEBUG, "Invalid operand on STPR PC=%x", PC);
	}
	F12WriteSecondOperand(2);
	F12END();
}


static UINT32 opSUBB(void) /* TRUSTED (C too!) */
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	SUBB(appb, (UINT8)f12Op1);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opSUBH(void) /* TRUSTED (C too!) */
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	SUBW(apph, (UINT16)f12Op1);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opSUBW(void) /* TRUSTED (C too!) */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	SUBL(appw, (UINT32)f12Op1);

	F12STOREOP2WORD();
	F12END();
}


static UINT32 opSUBCB(void)
{
	UINT8 appb;
	UINT8 src;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	src = (UINT8)f12Op1 + (_CY?1:0);
	SUBB(appb, src);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opSUBCH(void)
{
	UINT16 apph;
	UINT16 src;

	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	src = (UINT16)f12Op1 + (_CY?1:0);
	SUBW(apph, src);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opSUBCW(void)
{
	UINT32 appw;
	UINT32 src;

	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	src = (UINT32)f12Op1 + (_CY?1:0);
	SUBL(appw, src);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opTEST1(void)
{
	F12DecodeOperands(ReadAM,2,ReadAM,2);

	_CY = ((f12Op2 & (1<<f12Op1))!=0);
	_Z = !(_CY);

	F12END();
}

static UINT32 opUPDPSWW(void)
{
	F12DecodeOperands(ReadAM,2,ReadAM,2);

	/* can only modify condition code and control fields */
	f12Op2 &= 0xFFFFFF;
	f12Op1 &= 0xFFFFFF;
	v60WritePSW((v60ReadPSW() & (~f12Op2)) | (f12Op1 & f12Op2));

	F12END();
}

static UINT32 opUPDPSWH(void)
{
	F12DecodeOperands(ReadAM,2,ReadAM,2);

	/* can only modify condition code fields */
	f12Op2 &= 0xFFFF;
	f12Op1 &= 0xFFFF;
	v60WritePSW((v60ReadPSW() & (~f12Op2)) | (f12Op1 & f12Op2));

	F12END();
}

static UINT32 opXCHB(void) /* TRUSTED */
{
	UINT8 appb, temp;

	F12DecodeOperands(ReadAMAddress,0,ReadAMAddress,0);

	F12LOADOP1BYTE();
	temp=appb;
	F12LOADOP2BYTE();
	F12STOREOP1BYTE();
	appb=temp;
	F12STOREOP2BYTE();

	F12END()
}

static UINT32 opXCHH(void) /* TRUSTED */
{
	UINT16 apph, temp;

	F12DecodeOperands(ReadAMAddress,1,ReadAMAddress,1);

	F12LOADOP1HALF();
	temp=apph;
	F12LOADOP2HALF();
	F12STOREOP1HALF();
	apph=temp;
	F12STOREOP2HALF();

	F12END()
}

static UINT32 opXCHW(void) /* TRUSTED */
{
	UINT32 appw, temp;

	F12DecodeOperands(ReadAMAddress,2,ReadAMAddress,2);

	F12LOADOP1WORD();
	temp=appw;
	F12LOADOP2WORD();
	F12STOREOP1WORD();
	appw=temp;
	F12STOREOP2WORD();

	F12END()
}

static UINT32 opXORB(void) /* TRUSTED (C too!) */
{
	UINT8 appb;
	F12DecodeOperands(ReadAM,0,ReadAMAddress,0);

	F12LOADOP2BYTE();

	XORB(appb, (UINT8)f12Op1);

	F12STOREOP2BYTE();
	F12END();
}

static UINT32 opXORH(void) /* TRUSTED (C too!) */
{
	UINT16 apph;
	F12DecodeOperands(ReadAM,1,ReadAMAddress,1);

	F12LOADOP2HALF();

	XORW(apph, (UINT16)f12Op1);

	F12STOREOP2HALF();
	F12END();
}

static UINT32 opXORW(void) /* TRUSTED (C too!) */
{
	UINT32 appw;
	F12DecodeOperands(ReadAM,2,ReadAMAddress,2);

	F12LOADOP2WORD();

	XORL(appw, (UINT32)f12Op1);

	F12STOREOP2WORD();
	F12END();
}

static UINT32 opMULX(void)
{
	INT32 a,b;
	INT64 res;

	F12DecodeOperands(ReadAM,2,ReadAMAddress,3);

	if (f12Flag2)
	{
		a=v60.reg[f12Op2&0x1F];
	}
	else
	{
		a=MemRead32(f12Op2);
	}

	res = (INT64)a * (INT64)(INT32)f12Op1;

	b = (INT32)((res >> 32)&0xffffffff);
	a = (INT32)(res&0xffffffff);

	_S = ((b & 0x80000000) != 0);
	_Z = (a == 0 && b == 0);

	if (f12Flag2)
	{
		v60.reg[f12Op2&0x1F]=a;
		v60.reg[(f12Op2&0x1F)+1]=b;
	}
	else
	{
		MemWrite32(f12Op2,a);
		MemWrite32(f12Op2+4,b);
	}

	F12END();
}

static UINT32 opMULUX(void)
{
	INT32 a,b;
	UINT64 res;

	F12DecodeOperands(ReadAM,2,ReadAMAddress,3);

	if (f12Flag2)
	{
		a=v60.reg[f12Op2&0x1F];
	}
	else
	{
		a=MemRead32(f12Op2);
	}

	res = (UINT64)a * (UINT64)f12Op1;
	b = (INT32)((res >> 32)&0xffffffff);
	a = (INT32)(res&0xffffffff);

	_S = ((b & 0x80000000) != 0);
	_Z = (a == 0 && b == 0);

	if (f12Flag2)
	{
		v60.reg[f12Op2&0x1F]=a;
		v60.reg[(f12Op2&0x1F)+1]=b;
	}
	else
	{
		MemWrite32(f12Op2,a);
		MemWrite32(f12Op2+4,b);
	}

	F12END();
}
