protected int Tas(int opcode)
{
lock (lockObject)
{
int mode = (opcode >> 3) & 0x07;
int reg = (opcode & 0x07);
IOperand op = cpu.ResolveSrcEA(mode, reg, Size.Byte);
int v = op.GetByte();
if (v == 0)
{
cpu.SetFlags(cpu.ZFlag);
}
else
{
cpu.ClrFlags(cpu.ZFlag);
}
if ((v & 0x080) != 0)
{
cpu.SetFlags(cpu.NFlag);
}
else
{
cpu.ClrFlags(cpu.NFlag);
}
cpu.ClrFlags(cpu.CFlag | cpu.VFlag);
if (!EmulateBrokenTAS)
{
op.SetByte(v | 0x80);
}
return(op.IsRegisterMode() ? 4 : 14 + op.GetTiming());
}
}
protected int TstByte(int opcode)
{
int mode = (opcode >> 3) & 0x07;
int reg = (opcode & 0x07);
IOperand op = cpu.ResolveSrcEA(mode, reg, Size.Byte);
int v = op.GetByte();
if (v == 0)
{
cpu.SetFlags(cpu.ZFlag);
}
else
{
cpu.ClrFlags(cpu.ZFlag);
}
if ((v & 0x080) != 0)
{
cpu.SetFlags(cpu.NFlag);
}
else
{
cpu.ClrFlags(cpu.NFlag);
}
cpu.ClrFlags(cpu.CFlag | cpu.VFlag);
return(4 + op.GetTiming());
}
protected int NotByte(int opcode)
{
IOperand op = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
int s = op.GetByte();
int r = (~s) & 0xFF;
op.SetByte(r);
cpu.CalcFlags(InstructionType.NOT, s, 0, r, Size.Byte);
return(op.IsRegisterMode() ? 4 : 8 + op.GetTiming());
}
protected int NegxByte(int opcode)
{
IOperand op = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
int s = op.GetByte();
int r = (0 - (s + (cpu.IsFlagSet(cpu.XFlag) ? 1 : 0)));
op.SetByte(r);
cpu.CalcFlags(InstructionType.NEGX, s, 0, r, Size.Byte);
return(op.IsRegisterMode() ? 4 : 8 + op.GetTiming());
}
protected int CmpByte(int opcode)
{
IOperand op = cpu.ResolveSrcEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
int s = op.GetByte();
int d = cpu.GetDataRegisterByte((opcode >> 9) & 0x07);
int r = d - s;
cpu.CalcFlags(InstructionType.CMP, s, d, r, Size.Byte);
return(4 + op.GetTiming());
}
protected int MoveByte(int opcode)
{
IOperand src = cpu.ResolveSrcEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Byte);
IOperand dst = cpu.ResolveDstEA((opcode >> 6) & 0x07, (opcode >> 9) & 0x07, Size.Byte);
int s = src.GetByte();
dst.SetByte(s);
cpu.CalcFlags(InstructionType.MOVE, s, s, s, Size.Byte);
return(ShortExecutionTime[src.Index()][dst.Index()]);
}
protected int EorByte(int opcode)
{
int s = cpu.GetDataRegisterByte((opcode >> 9) & 0x07);
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Byte);
int d = dst.GetByte();
int r = s ^ d;
dst.SetByte(r);
cpu.CalcFlags(InstructionType.EOR, s, d, r, Size.Byte);
return(dst.IsRegisterMode() ? 4 : 8 + dst.GetTiming());
}
protected int ClrByte(int opcode)
{
IOperand op = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
op.GetByte();
op.SetByte(0);
int flags = cpu.GetCCRegister();
flags &= ~(cpu.NFlag | cpu.CFlag | cpu.VFlag);
flags |= cpu.ZFlag;
cpu.SetCCRegister(flags);
return(op.IsRegisterMode() ? 4 : 8 + op.GetTiming());
}
protected int Nbcd(int opcode)
{
int mode = (opcode >> 3) & 0x07;
int reg = (opcode & 0x07);
IOperand op = cpu.ResolveDstEA(mode, reg, Size.Byte);
int s = op.GetByte();
int x = (cpu.IsFlagSet(cpu.XFlag) ? 1 : 0);
int c;
int lo = 10 - (s & 0x0f) - x;
if (lo < 10)
{
c = 1;
}
else
{
lo = 0;
c = 0;
}
int hi = 10 - ((s >> 4) & 0x0f) - c;
if (hi < 10)
{
c = 1;
}
else
{
c = 0;
hi = 0;
}
int result = (hi << 4) + lo;
if (c != 0)
{
cpu.SetFlags(cpu.XFlag | cpu.CFlag);
}
else
{
cpu.ClrFlags(cpu.XFlag | cpu.CFlag);
}
if (result != 0)
{
cpu.ClrFlags(cpu.ZFlag);
}
op.SetByte(result);
return(op.IsRegisterMode() ? 6 : 8);
}
protected int EoriByte(int opcode)
{
int s = cpu.FetchPCWord() & 0x00ff;
IOperand dst = cpu.ResolveDstEA((opcode >> 3) & 0x07, opcode & 0x07, Size.Byte);
int d = dst.GetByte();
int r = s ^ d;
dst.SetByte(r);
if (!dst.IsSR())
{
cpu.CalcFlags(InstructionType.EOR, s, d, r, Size.Byte);
}
return(dst.IsRegisterMode() ? 8 : 12 + dst.GetTiming());
}
protected int BtstDynByte(int opcode)
{
var bit = cpu.GetDataRegisterLong((opcode >> 9) & 0x07) & 7;
bit = 1 << bit;
IOperand op = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
int val = op.GetByte();
if ((val & bit) != 0)
{
cpu.ClrFlags(cpu.ZFlag);
}
else
{
cpu.SetFlags(cpu.ZFlag);
}
return(4 + op.GetTiming());
}
protected int BtstStaticByte(int opcode)
{
var bit = cpu.FetchPCWord() & 0x07;
bit = 1 << bit;
IOperand op = cpu.ResolveDstEA((opcode >> 3) & 0x07, (opcode & 0x07), Size.Byte);
int val = op.GetByte();
if ((val & bit) != 0)
{
cpu.ClrFlags(cpu.ZFlag);
}
else
{
cpu.SetFlags(cpu.ZFlag);
}
return(8 + op.GetTiming());
}