partial void Execute_LoadCommand()
{
var openFileDialog = new Microsoft.Win32.OpenFileDialog()
{
Filter = "HEX file (*.hex)|*.hex"
};
var result = openFileDialog.ShowDialog();
if (result ?? false)
{
var fileName = openFileDialog.FileName;
var(RAM, startAddr, endAddr) = HexFileLoader.Read(fileName, new byte[64 * 1024]);
_basicBus = new BasicBus(RAM);
RawMemory = _basicBus.RAM;
_cpu.ConnectToBus(_basicBus);
Memory = BuildMemoryMap();
_cpu.PC = startAddr;
ProgramCounter = _cpu.PC.ToString("X4");
MemoryMapRow = GetMemoryMapRow(startAddr);
var disassembly = _cpu.Disassemble(startAddr, endAddr);
DisAsm = GetDisassembedProgram(disassembly);
SelectedRow = startAddr.ToString("X4");
}
}
public void LoadAwithValueWhenOperationIsLDAn()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0x3E },
{ 0x0081, 0x02 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
// Load 2 into register A, which starts out having a value of 3...
var cpu = new Z80()
{
A = 0x03, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x02, cpu.A);
// No affect on Condition Flags
FlagsUnchanged(cpu);
}
private void HandleStrayOpCodes2()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xDD },
{ 0x0081, 0xDD },
{ 0x0082, 0xDD },
{ 0x0083, 0xFD },
{ 0x0084, 0xDD }, // LD IX &1000
{ 0x0085, 0x21 },
{ 0x0086, 0x00 },
{ 0x0087, 0x10 },
{ 0x0088, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x00, IX = 0x00, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
while (cpu.PC < 0x0088)
{
cpu.Step();
}
Assert.Equal(0x1000, cpu.IX);
}
public void LoadRfromA()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xED },
{ 0x0081, 0x4F },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x17, R = 0x00, IFF2 = true, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x17, cpu.A);
Assert.Equal(0x17, cpu.R);
// No affect on Condition Flags
FlagsUnchanged(cpu);
}
private void SwapRegistersWithEXX()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xD9 }, // EXX
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
B = 0x11, C = 0x22, D = 0x12, E = 0x23, H = 0x14, L = 0x24, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x0000, cpu.BC);
Assert.Equal(0x1122, cpu.BC1);
Assert.Equal(0x0000, cpu.DE);
Assert.Equal(0x1223, cpu.DE1);
Assert.Equal(0x0000, cpu.HL);
Assert.Equal(0x1424, cpu.HL1);
FlagsUnchanged(cpu);
}
private void SwapAFandAFPrime()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0x08 }, // EX AF,AF'
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x11, F = (Flags)0x22, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x0000, cpu.AF);
Assert.Equal(0x1122, cpu.AF1);
FlagsUnchanged(cpu);
}
private void SwapDEandHL()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xEB }, // EX DE,HL
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
D = 0x11, E = 0x22, H = 0x33, L = 0x44, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x3344, cpu.DE);
Assert.Equal(0x1122, cpu.HL);
FlagsUnchanged(cpu);
}
private void JumpToIY()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xFD }, // JR IY
{ 0x0081, 0xE9 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
{ 0x0085, 0x00 },
{ 0x0086, 0x00 }, // <- jump here
{ 0x0087, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x00, IY = 0x0086, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x086, cpu.PC);
FlagsUnchanged(cpu);
}
private void EnableInterruptBySettingIFF()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xFB }, // EI
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.True(cpu.IFF1);
Assert.True(cpu.IFF2);
}
private void JumpForwardFourForJRNZPositiveSix_NotZeroSet()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0x20 }, // JR NZ $+6
{ 0x0081, 0x04 }, // Assembler with compensate for PC incrementing twice
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
{ 0x0085, 0x00 },
{ 0x0086, 0x00 }, // <- jump here
{ 0x0087, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x0080
};
cpu.F = (Flags)0b00000000; // Reset Z flag
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x086, cpu.PC);
}
private void DoNotJumpForwardFourForJRCPositiveSix_CarryNotSet()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0x38 }, // JR C $+6
{ 0x0081, 0x04 }, // Assembler with compensate for PC incrementing twice
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
{ 0x0085, 0x00 },
{ 0x0086, 0x00 },
{ 0x0087, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x082, cpu.PC);
FlagsUnchanged(cpu);
}
private void NotJumpBackFourForDJNZ_WhenZero()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x007C, 0x00 }, // <- jump here
{ 0x007D, 0x00 },
{ 0x007E, 0x00 },
{ 0x007F, 0x00 },
{ 0x0080, 0x10 }, // DJNZ $-4
{ 0x0081, 0xFA }, // Assembler with compensate for PC incrementing twice
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
{ 0x0085, 0x00 },
{ 0x0086, 0x00 },
{ 0x0087, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
B = 0x01, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x082, cpu.PC);
}
private void DisassembleArithmetic1HexFileCorrectly()
{
var fakeBus = A.Fake <IBus>();
var expectedDisassembly = new Dictionary <ushort, string>
{
{ 0x0080, "LD A,&05" },
{ 0x0082, "LD B,&0A" },
{ 0x0084, "ADD A,B" },
{ 0x0085, "ADD A,A" },
{ 0x0086, "LD C,&0F" },
{ 0x0088, "SUB A,C" },
{ 0x0089, "LD H,&08" },
{ 0x008B, "LD L,&FF" },
{ 0x008D, "LD (HL),A" },
{ 0x008E, "NOP" },
};
var ram = HexFileReader.Read("../../../HexFiles/Arithmetic1.hex");
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => ram[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
var disassembledCode = cpu.Disassemble(0x0080, 0x008E);
Assert.Equal(expectedDisassembly, disassembledCode);
}
private void LoadProgramCounterWithAddressForJPNN()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xC3 }, // JP 0191h
{ 0x0081, 0x91 },
{ 0x0082, 0x01 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
{ 0x0190, 0x00 },
{ 0x0191, 0x00 }, // <- jump here
{ 0x0192, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x0191, cpu.PC);
FlagsUnchanged(cpu);
}
private void DisassembleMultiplicationHexFileCorrectly()
{
var fakeBus = A.Fake <IBus>();
var ram = HexFileReader.Read("../../../HexFiles/Multiplication.hex");
var expectedDisassembly = new Dictionary <ushort, string>
{
{ 0x8000, "LD BC,&0015" },
{ 0x8003, "LD B,&08" },
{ 0x8005, "LD DE,&002A" },
{ 0x8008, "LD D,&00" },
{ 0x800A, "LD HL,&0000" },
{ 0x800D, "SRL C" },
{ 0x800F, "JR C,$+3" },
{ 0x8011, "ADD HL,DE" },
{ 0x8012, "SLA E" },
{ 0x8014, "RL D" },
{ 0x8016, "DEC B" },
{ 0x8017, "JP NZ,&800D" },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => ram[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x8000
};
cpu.ConnectToBus(fakeBus);
var disassembledCode = cpu.Disassemble(0x8000, 0x8017);
Assert.Equal(expectedDisassembly, disassembledCode);
}
private void SetInterruptMode2()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xED }, // IM 2
{ 0x0081, 0x5E },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.True(cpu.InterruptMode == InterruptMode.Mode2);
}
private void DisassembleDDCBandFDCBOpcodesCorrectly()
{
var fakeBus = A.Fake <IBus>();
var ram = HexFileReader.Read("../../../HexFiles/TestDDCBandFDCB.hex");
var expectedDisassembly = new Dictionary <ushort, string>
{
{ 0x8000, "RL (IX+2)" },
{ 0x8004, "RL (IY-3)" },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => ram[addr]);
var cpu = new Z80()
{
A = 0x00, PC = 0x8000
};
cpu.ConnectToBus(fakeBus);
var disassembledCode = cpu.Disassemble(0x8000, 0x8007);
Assert.Equal(expectedDisassembly, disassembledCode);
}
private void DecrementRegisterFlagsTest2()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0x15 },
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
D = 0x80, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x7F, cpu.D);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N);
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.False((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.True((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.True((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.False((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.True((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.True((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
static void Main(string[] args)
{
var ram = new byte[65536];
Array.Clear(ram, 0, ram.Length);
var romData = File.ReadAllBytes(_rom);
if (romData.Length != 16384)
{
throw new InvalidOperationException("Not a valid ROM file");
}
Array.Copy(romData, ram, 16384);
_cpu = new Z80();
IBus simpleBus = new SimpleBus(ram);
_cpu.ConnectToBus(simpleBus);
Console.Clear();
while (!(Console.KeyAvailable && (Console.ReadKey(true).Key == ConsoleKey.Escape)))
{
try
{
_cpu.Step();
Console.Write($"\rPC: {_cpu.PC.ToString("X4")}");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
Console.ReadLine();
}
}
Console.WriteLine();
Console.WriteLine();
for (var i = 0x4000; i < 0x5800; i++)
{
if (i % 16 == 0)
{
Console.Write("{0:X4} | ", i);
}
{
Console.Write("{0:x2} ", ram[i]);
}
if (i % 8 == 7)
{
Console.Write(" ");
}
if (i % 16 == 15)
{
Console.WriteLine();
}
}
}
public void LoadAWithNegative7WhenSubtracting6And12AndCarryFlagSetForOpcodeSBCAN()
{
// ======================================
// Testing a negative result: 6 - 12 - 1 = -6
// ======================================
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xDE }, // SBC A, n
{ 0x0081, 0x0C }, // n = 12
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 },
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x00 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x06, F = Z80.Flags.C, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0xF9, cpu.A);
sbyte signedResult = (sbyte)cpu.A;
Assert.Equal(-7, signedResult);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N); // Set due to a subtraction
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.True((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.True((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.False((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.True((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.True((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.True((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
private void DecrementValueAtLocationPointedToByIYPlusDFlagsTest()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xFD },
{ 0x0081, 0x35 },
{ 0x0082, 0x03 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 }, // <- (IX)
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x80 }, // <- (IX+3)
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
A.CallTo(() => fakeBus.Write(A <ushort> ._, A <byte> ._))
.Invokes((ushort addr, byte data) => UpdateMemory(addr, data));
var cpu = new Z80()
{
A = 0x00, IY = 0x08FF, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x7F, program[(ushort)(cpu.IY + 3)]);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N);
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.False((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.True((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.True((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.False((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.True((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.True((cpu.F & Z80.Flags.X) == Z80.Flags.X);
void UpdateMemory(ushort addr, byte data)
{
program[addr] = data;
}
}
public Results RunTests()
{
ReadFuseTestsFile();
ReadFuseExpectedFile();
_cpu = new Z80();
foreach (var test in _tests)
{
var testName = test.Key;
var opCode = testName.Split('_')[0];
_cpu.Reset(true);
var isExtendedNopTest = opCode == "dd00" || opCode == "fddd00";
if (_cpu.IsOpCodeSupported(opCode) || isExtendedNopTest)
{
// Run test
var testToRun = test.Value;
var registers = testToRun.Registers;
var memory = testToRun.Memory;
var states = testToRun.States;
InitialiseRegisters(registers);
InitialiseMemory(memory);
InitialiseStates(states);
_cpu.ConnectToBus(_bus);
var runToAddress = _expected[testName].Registers[11];
do
{
_cpu.Step();
} while (_cpu.PC < runToAddress);
var(pass, details) = CompareActualWithExpected(_expected[testName]);
if (pass)
{
_passing.Add(testName);
}
else
{
_failing.Add(testName, details);
}
}
else
{
_notImplemented.Add(testName);
}
}
return(new Results(_passing, _failing, _notImplemented));
}
public void LoadAWithThreeWhenSubtracting8And5ForOpcodeSUBAN()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xD6 }, // SUB A, n
{ 0x0081, 0x05 }, // n = 5
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 },
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x00 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x08, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x03, cpu.A);
sbyte signedResult = (sbyte)cpu.A;
Assert.Equal(3, signedResult);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N); // Set due to a subtraction
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.False((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.False((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.False((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.False((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.False((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.False((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
public void LoadMemoryLocationPointedToByHLwithValueInAccumulator()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0x77 },
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 }, // (HL)
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x00 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
A.CallTo(() => fakeBus.Write(A <ushort> ._, A <byte> ._))
.Invokes((ushort addr, byte data) => UpdateMemory(addr, data));
// Load the value in register A (0x11), into the memory location pointed to by (HL)...
var cpu = new Z80()
{
A = 0x11, H = 0x08, L = 0xFF, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x11, program[0x08FF]);
// No affect on Condition Flags
FlagsUnchanged(cpu);
void UpdateMemory(ushort addr, byte data)
{
program[addr] = data;
}
}
public void LoadMemoryLocationPointedToByIYplusDwithValueN_GivenDisNegative()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xFD },
{ 0x0081, 0x36 },
{ 0x0082, 0xFE },
{ 0x0083, 0xBB },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 }, // <- d = -2
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 }, // (IY)
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x00 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
A.CallTo(() => fakeBus.Write(A <ushort> ._, A <byte> ._))
.Invokes((ushort addr, byte data) => UpdateMemory(addr, data));
var cpu = new Z80()
{
A = 0x0F, IY = 0x08FF, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0xBB, program[0x08FF - 2]);
// No affect on Condition Flags
FlagsUnchanged(cpu);
void UpdateMemory(ushort addr, byte data)
{
program[addr] = data;
}
}
public void LoadAWith7WhenSubtracting4FromBAndCarryFlagSetForOpcodeSBCAR()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0x98 }, //SBC A, B
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 },
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x00 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x0C, B = 0x04, F = Z80.Flags.C, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x07, cpu.A);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N);
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.False((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.False((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.False((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.False((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.False((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.False((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
public void LoadAWith6WhenSubtractingLocationPointedToByIXFrom10ForOpcodeSUBAIXD_GivenDisNegative()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xDD },
{ 0x0081, 0x96 }, // SUB A, (IX+d)
{ 0x0082, 0xFE }, // d = -2
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x04 }, // (IX-2)
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 }, // <- (IX)
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x00 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x0A, IX = 0x08FF, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x06, cpu.A);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N);
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.False((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.False((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.False((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.False((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.False((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.False((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
public void LoadAWith9WhenSubtracting4FromLocationPointedToByIYForOpcodeSBCAHL_GivenDisPositive()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xFD },
{ 0x0081, 0x9E }, // SBC A, (IY+d)
{ 0x0082, 0x03 }, // d = 3
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 }, // <- (IY)
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x04 }, // (IY+3)
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x0E, IY = 0x08FF, F = Z80.Flags.C, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x09, cpu.A);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N);
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.False((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.False((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.False((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.False((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.False((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.True((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
private void UnsetZeroFlagWhenFalseForCPIYD2()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xFD }, // CP (IY+3)
{ 0x0081, 0xBE },
{ 0x0082, 0x03 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x00 }, // <- (IY)
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x02 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x01, IY = 0x08FF, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x01, cpu.A);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N);
Assert.False((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.True((cpu.F & Z80.Flags.S) == Z80.Flags.S); // Negative comparison
Assert.True((cpu.F & Z80.Flags.H) == Z80.Flags.H); // Borrow from bit 4
Assert.False((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.True((cpu.F & Z80.Flags.C) == Z80.Flags.C); // Borrow from "bit 8"
Assert.False((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.False((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
private void SetZeroFlagWhenTrueForCPHL()
{
var fakeBus = A.Fake <IBus>();
var program = new Dictionary <ushort, byte>
{
// Program Code
{ 0x0080, 0xBE }, // CP (HL)
{ 0x0081, 0x00 },
{ 0x0082, 0x00 },
{ 0x0083, 0x00 },
{ 0x0084, 0x00 },
// Data
{ 0x08FB, 0x00 },
{ 0x08FC, 0x00 },
{ 0x08FD, 0x00 },
{ 0x08FE, 0x00 },
{ 0x08FF, 0x01 }, // <- (HL)
{ 0x0900, 0x00 },
{ 0x0901, 0x00 },
{ 0x0902, 0x00 },
{ 0x0903, 0x00 },
{ 0x0904, 0x00 },
{ 0x0905, 0x00 },
{ 0x0906, 0x00 },
};
A.CallTo(() => fakeBus.Read(A <ushort> ._, A <bool> ._))
.ReturnsLazily((ushort addr, bool ro) => program[addr]);
var cpu = new Z80()
{
A = 0x01, H = 0x08, L = 0xFF, PC = 0x0080
};
cpu.ConnectToBus(fakeBus);
cpu.Step();
Assert.Equal(0x01, cpu.A);
Assert.True((cpu.F & Z80.Flags.N) == Z80.Flags.N);
Assert.True((cpu.F & Z80.Flags.Z) == Z80.Flags.Z);
Assert.False((cpu.F & Z80.Flags.S) == Z80.Flags.S);
Assert.False((cpu.F & Z80.Flags.H) == Z80.Flags.H);
Assert.False((cpu.F & Z80.Flags.P) == Z80.Flags.P);
Assert.False((cpu.F & Z80.Flags.C) == Z80.Flags.C);
Assert.False((cpu.F & Z80.Flags.U) == Z80.Flags.U);
Assert.False((cpu.F & Z80.Flags.X) == Z80.Flags.X);
}
