public string GetSyntax(OpCodeDefinition opCodeDefinition, IAddressingMode addressingMode, CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
return(string.Empty);
}
public ushort GetAddress(CPUMemory memory, CPURegisters registers, byte operand1, byte operand2, out bool pageBoundaryCrossed)
{
pageBoundaryCrossed = false;
return((byte)(operand1 + registers.Y));
}
public byte Execute(OpCodeDefinition opCodeDefinition, IAddressingMode addressingMode, CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
var operationValue = memory.Stack.Span[++registers.SP];
registers.N_NegativeFlag = (byte)((operationValue & 0x80) >> 7);
registers.Z_ZeroFlag = (byte)(operationValue == 0 ? 1 : 0);
registers.A = operationValue;
return(opCodeDefinition.ExecutionCycles);
}
public string GetSyntax(CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
return($"${operand1:X02},Y @ {(byte)(operand1 + registers.Y):X02}");
}
public void SetValue(CPUMemory memory, CPURegisters registers, ushort address, byte value)
{
memory[address] = value;
}
public void SetValue(CPUMemory memory, CPURegisters registers, byte operand1, byte operand2, byte value, out bool pageBoundaryCrossed)
{
var address = GetAddress(memory, registers, operand1, operand2, out pageBoundaryCrossed);
memory[address] = value;
}
public byte GetValue(CPUMemory memory, CPURegisters registers, ushort address)
{
return(memory[address]);
}
public byte GetValue(CPUMemory memory, CPURegisters registers, byte operand1, byte operand2, out bool pageBoundaryCrossed)
{
var address = GetAddress(memory, registers, operand1, operand2, out pageBoundaryCrossed);
return(memory[address]);
}
