public byte Execute(OpCodeDefinition opCodeDefinition, IAddressingMode addressingMode, CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
var operationAddress = addressingMode.GetAddress(memory, registers, operand1, operand2, out bool pageBoundaryCrossed);
registers.PC = operationAddress;
return((byte)(opCodeDefinition.ExecutionCycles + (opCodeDefinition.AddExecutionCycleOnPageBoundaryCross && pageBoundaryCrossed ? 1 : 0)));
}
public byte Execute(OpCodeDefinition opCodeDefinition, IAddressingMode addressingMode, CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
var pageBoundaryCrossed = false;
if (opCodeDefinition.AddExecutionCycleOnPageBoundaryCross)
{
addressingMode.GetAddress(memory, registers, operand1, operand2, out pageBoundaryCrossed);
}
return((byte)(opCodeDefinition.ExecutionCycles + (opCodeDefinition.AddExecutionCycleOnPageBoundaryCross && pageBoundaryCrossed ? 1 : 0)));
}
public byte Execute(OpCodeDefinition opCodeDefinition, IAddressingMode addressingMode, CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
var operationAddress = addressingMode.GetAddress(memory, registers, operand1, operand2, out _);
var operationValue = addressingMode.GetValue(memory, registers, operationAddress);
var result = operationValue + 1;
registers.N_NegativeFlag = (byte)((result & 0x80) >> 7);
registers.Z_ZeroFlag = (byte)((byte)result == 0 ? 1 : 0);
addressingMode.SetValue(memory, registers, operationAddress, (byte)result);
return(opCodeDefinition.ExecutionCycles);
}
public byte Execute(OpCodeDefinition opCodeDefinition, IAddressingMode addressingMode, CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
var operationAddress = addressingMode.GetAddress(memory, registers, operand1, operand2, out bool pageBoundaryCrossed);
var branchTaken = false;
if (registers.N_NegativeFlag == 0)
{
registers.PC = operationAddress;
branchTaken = true;
}
return((byte)(opCodeDefinition.ExecutionCycles + (opCodeDefinition.AddExecutionCycleOnPageBoundaryCross && pageBoundaryCrossed && branchTaken ? 1 : 0) + (branchTaken ? 1 : 0)));
}
public byte Execute(OpCodeDefinition opCodeDefinition, IAddressingMode addressingMode, CPUMemory memory, CPURegisters registers, byte operand1, byte operand2)
{
var operationAddress = addressingMode.GetAddress(memory, registers, operand1, operand2, out bool pageBoundaryCrossed);
var operationValue = addressingMode.GetValue(memory, registers, operationAddress);
var result = operationValue << 1 | registers.C_CarryFlag;
registers.N_NegativeFlag = (byte)((result & 0x80) >> 7);
registers.C_CarryFlag = (byte)((operationValue & 0x80) >> 7);
registers.Z_ZeroFlag = (byte)((byte)result == 0x00 ? 1 : 0);
addressingMode.SetValue(memory, registers, operationAddress, (byte)result);
return((byte)(opCodeDefinition.ExecutionCycles + (opCodeDefinition.AddExecutionCycleOnPageBoundaryCross && pageBoundaryCrossed ? 1 : 0)));
}
