public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
var al = cpu.GetRegisterU8(Register.AL);
var flags = cpu.GetFlags();
if ((al & 0xF) > 9 || flags.Has(FlagsRegister.Auxiliary))
{
var ah = cpu.GetRegisterU8(Register.AH);
al = (byte)((al + 6) & 0x0F);
ah++;
cpu.SetRegisterU8(Register.AH, ah);
flags |= FlagsRegister.Carry | FlagsRegister.Auxiliary;
}
else
{
al &= 0x0F;
flags &= ~(FlagsRegister.Carry | FlagsRegister.Auxiliary);
}
flags &= ~(FlagsRegister.Parity | FlagsRegister.Zero | FlagsRegister.Sign);
flags |= (InstructionHelper.ParityLookup[al] ? FlagsRegister.Parity : 0) |
(al == 0 ? FlagsRegister.Zero : 0) |
((al & 0x80) != 0 ? FlagsRegister.Sign : 0);
cpu.SetFlags(flags);
cpu.SetRegisterU8(Register.AL, al);
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
var al = cpu.GetRegisterU8(Register.AL);
var oldAl = al;
var flags = cpu.GetFlags();
var oldCarry = flags.Has(FlagsRegister.Carry);
flags &= ~FlagsRegister.Carry;
if ((al & 0xF) > 9 || flags.Has(FlagsRegister.Auxiliary))
{
al -= 6;
if (oldCarry || (al > oldAl))
{
flags |= FlagsRegister.Carry;
}
else
{
flags &= ~FlagsRegister.Carry;
}
flags |= FlagsRegister.Auxiliary;
}
else
{
flags &= ~FlagsRegister.Auxiliary;
}
if (oldAl > 0x99 || oldCarry)
{
al -= 0x60;
flags |= FlagsRegister.Carry;
}
else
{
flags &= ~FlagsRegister.Carry;
}
flags &= ~(FlagsRegister.Parity | FlagsRegister.Zero | FlagsRegister.Sign);
flags |= (InstructionHelper.ParityLookup[al] ? FlagsRegister.Parity : 0) |
(al == 0 ? FlagsRegister.Zero : 0) |
((al & 0x80) != 0 ? FlagsRegister.Sign : 0);
cpu.SetFlags(flags);
cpu.SetRegister(Register.AL, al);
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
cpu.SetFlags(cpu.GetFlags() & ~FlagsRegister.Direction);
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
cpu.SetFlags(cpu.GetFlags() | FlagsRegister.Interrupt);
}