public void DEC_A_WorksAsExpected()
{
// --- Arrange
var m = new Z80TestMachine(RunMode.UntilEnd);
m.InitCode(new byte[]
{
0x3E, 0x43, // LD A,43H
0x3D // DEC A
});
// --- Act
m.Run();
// --- Assert
var regs = m.Cpu.Registers;
m.ShouldKeepRegisters(except: "A, F");
m.ShouldKeepMemory();
m.ShouldKeepCFlag();
regs.NFlag.ShouldBeTrue();
regs.A.ShouldBe((byte)0x42);
regs.PC.ShouldBe((ushort)0x0003);
m.Cpu.Tacts.ShouldBe(11L);
}
public void DEC_B_SetsHalfCarryFlags()
{
// --- Arrange
var m = new Z80TestMachine(RunMode.UntilEnd);
m.InitCode(new byte[]
{
0x06, 0x20, // LD B,20H
0x05 // DEC B
});
// --- Act
m.Run();
// --- Assert
var regs = m.Cpu.Registers;
m.ShouldKeepRegisters(except: "B, F");
m.ShouldKeepMemory();
m.ShouldKeepCFlag();
regs.NFlag.ShouldBeTrue();
regs.HFlag.ShouldBeTrue();
regs.B.ShouldBe((byte)0x1F);
regs.PC.ShouldBe((ushort)0x0003);
m.Cpu.Tacts.ShouldBe(11L);
}
public void INC_C_WorksAsExpected()
{
// --- Arrange
var m = new Z80TestMachine(RunMode.UntilEnd);
m.InitCode(new byte[]
{
0x0E, 0x43, // LD C,43H
0x0C // INC C
});
// --- Act
m.Run();
// --- Assert
var regs = m.Cpu.Registers;
m.ShouldKeepRegisters(except: "C, F");
m.ShouldKeepMemory();
m.ShouldKeepCFlag();
regs.NFlag.ShouldBeFalse();
regs.C.ShouldBe((byte)0x44);
regs.PC.ShouldBe((ushort)0x0003);
m.Cpu.Tacts.ShouldBe(11L);
}
public void INC_B_SetsSignAnOverflowFlags()
{
// --- Arrange
var m = new Z80TestMachine(RunMode.UntilEnd);
m.InitCode(new byte[]
{
0x06, 0x7F, // LD B,7FH
0x04 // INC B
});
// --- Act
m.Run();
// --- Assert
var regs = m.Cpu.Registers;
m.ShouldKeepRegisters(except: "B, F");
m.ShouldKeepMemory();
m.ShouldKeepCFlag();
regs.NFlag.ShouldBeFalse();
regs.SFlag.ShouldBeTrue();
regs.PFlag.ShouldBeTrue();
regs.B.ShouldBe((byte)0x80);
regs.PC.ShouldBe((ushort)0x0003);
m.Cpu.Tacts.ShouldBe(11L);
}
