public SpaceInvaders(Action <int, bool> playSound)
{
_bus = new Bus();
_i8080 = new I8080(_bus);
_shiftRegister = new ShiftRegister(_bus);
_cycles = 0;
_playSound = playSound;
_bus.RegisterInputIODevice(0x01, this);
_bus.RegisterOutputIODevice(0x03, this);
_bus.RegisterOutputIODevice(0x05, this);
}
static void RunTest(string filename)
{
var sw = Stopwatch.StartNew();
ulong instructionCount = 0;
// load rom
byte[] rom = File.ReadAllBytes(filename);
Bus bus = new Bus();
bus.Load(0x0100, rom);
// patch memory location 5 as a ret instruction
// call 5 is a call into BDOS, intercepted below
bus.WriteByte(0x0005, 0xC9);
// patch in ram size
bus.WriteByte(0x0006, 0x00);
bus.WriteByte(0x0007, 0x17);
I8080 cpu = new I8080(bus)
{
PC = 0x100
};
Console.WriteLine();
Console.WriteLine("***** Running rom {0} *****", Path.GetFileName(filename));
Console.WriteLine();
while (true)
{
ushort pc = cpu.PC;
// trap any HLT instructions
if (bus.ReadByte(pc) == 0x76)
{
Console.WriteLine("HLT at 0x{0:X4}", pc);
Environment.Exit(0);
}
// intercept BDOS calls, http://www.seasip.info/Cpm/bdos.html
if (pc == 0x0005)
{
switch (cpu.R.C)
{
case 2: // BDOS function 2 (C_WRITE) - Console output
{
// Entered with C=2, E=ASCII character.
Console.Write((char)cpu.R.E);
}
break;
case 9: // BDOS function 9 (C_WRITESTR) - Output string
{
// Entered with C=9, DE=address of string.
// Display a string of ASCII characters, terminated with the $ character.
StringBuilder sb = new StringBuilder();
char output;
ushort i = cpu.R.DE;
while ((output = (char)bus.ReadByte(i++)) != '$')
{
sb.Append(output);
}
Console.Write(sb.ToString());
}
break;
}
}
instructionCount++;
cpu.ExecuteInstruction();
// if we jumped to 0 then end this test
if (cpu.PC == 0x0000)
{
sw.Stop();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine($"Jump to 0x0000 from 0x{pc:X4}, {instructionCount} instructions executed, {sw.ElapsedMilliseconds}ms elapsed, {(double)instructionCount / sw.ElapsedMilliseconds} instructions/ms");
return;
}
}
}
