public void Test88()
{
byte value8;
i8086CPU cpu = GetCPU(new byte[] { 0x88, 0x4f, 0x10 } /* MOV [bx+10],CL */);
value8 = 0x2f;
cpu.EU.Registers.CL = value8;
cpu.NextInstruction();
Assert.AreEqual(value8, cpu.Bus.GetData8(cpu.EU.Registers.BX + 0x10), "Instruction 0x88 failed");
cpu.Boot(new byte[] { 0x88, 0x8f, 0x10, 0x00 } /* MOV [bx+10],CL using 16 bit displacement */);
value8 = 0x2f;
cpu.EU.Registers.CL = value8;
cpu.NextInstruction();
Assert.AreEqual(value8, cpu.Bus.GetData8(cpu.EU.Registers.BX + 0x10), "Instruction 0x88 failed");
// Test with segment override
cpu.Boot(new byte[] { 0x26, 0x88, 0x8f, 0x10, 0x00 } /* MOV [bx+10],CL using 16 bit displacement with ES override */);
value8 = 0x2f;
cpu.EU.Registers.CL = value8;
// only need to call NextInstruction once because when there is a segment override the next instruction is always
// executed immediately. In a real system, interrupts are not allowed after a segment override.
cpu.NextInstruction();
// now set the override again so the correct memory segment is accessed
cpu.Bus.SegmentOverride = i8086BusInterfaceUnit.SegmentOverrideState.UseES;
Assert.AreEqual(value8, cpu.Bus.GetData8(cpu.EU.Registers.BX + 0x10), "Instruction 0x88 failed");
}
private i8086CPU GetCPU(byte[] program)
{
i8086CPU cpu = new i8086CPU();
cpu.Boot(program);
cpu.Bus.DS = 0x2000;
cpu.Bus.SS = 0x4000;
cpu.Bus.ES = 0x6000;
return(cpu);
}
public void Test88()
{
byte value8;
i8086CPU cpu = GetCPU(new byte[] { 0x88, 0x4f, 0x10 } /* MOV [bx+10],CL */);
value8 = 0x2f;
cpu.EU.Registers.CL = value8;
cpu.NextInstruction();
Assert.AreEqual(value8, cpu.Bus.GetData8(cpu.EU.Registers.BX + 0x10), "Instruction 0x88 failed");
cpu.Boot(new byte[] { 0x88, 0x8f, 0x10, 0x00 } /* MOV [bx+10],CL using 16 bit displacement */);
value8 = 0x2f;
cpu.EU.Registers.CL = value8;
cpu.NextInstruction();
Assert.AreEqual(value8, cpu.Bus.GetData8(cpu.EU.Registers.BX + 0x10), "Instruction 0x88 failed");
// Test with segment override
cpu.Boot(new byte[] { 0x26, 0x88, 0x8f, 0x10, 0x00 } /* MOV [bx+10],CL using 16 bit displacement with ES override */);
value8 = 0x2f;
cpu.EU.Registers.CL = value8;
cpu.NextInstruction();
Assert.AreEqual(i8086BusInterfaceUnit.SegmentOverrideState.UseES, cpu.Bus.SegmentOverride, "Invalid segment override value");
cpu.NextInstruction();
// after the instruction the override should be turned off
Assert.AreEqual(i8086BusInterfaceUnit.SegmentOverrideState.NoOverride, cpu.Bus.SegmentOverride, "Invalid segment override value");
// now set the override again so the correct memory segment is accessed
cpu.Bus.SegmentOverride = i8086BusInterfaceUnit.SegmentOverrideState.UseES;
Assert.AreEqual(value8, cpu.Bus.GetData8(cpu.EU.Registers.BX + 0x10), "Instruction 0x88 failed");
}