static void Main(string[] args)
{
MEM memory = new MEM();
CPU cpu = new CPU(memory);
memory.setMem(0xFFFC, 0x00); //reset vector
memory.setMem(0xFFFD, 0x00);
memory.setMem(0x0000, 0xA9); // LDA 0x05
memory.setMem(0x0001, 0x05);
memory.setMem(0x0002, 0xEA); //NOP
memory.setMem(0x0003, 0x85); // STA 0x00FF
memory.setMem(0x0004, 0x00);
memory.setMem(0x0005, 0xFF);
memory.setMem(0x0006, 0xE6); // INC 0x00FF
memory.setMem(0x0007, 0x00);
memory.setMem(0x0008, 0xFF);
memory.setMem(0x0009, 0x00); // BRK
cpu.reset();
while (!cpu.B)
{
cpu.tick();
cycles++;
}
printFirstChunk(memory);
Console.WriteLine("\nPC is at " + cpu.PC);
Console.WriteLine("Was runnig for " + cycles + " cycles");
Console.WriteLine("Result is " + memory.getMem(0x00FF));
}
public static void execute(CPU cpu, MEM memory)
{
switch (memory.getMem(cpu.PC))
{
case 0xA9:
case 0xA5:
case 0xB5:
case 0xAD:
case 0xBD:
case 0xB9:
case 0xA1:
case 0xB1:
LS_Operations.LDA.execute(cpu, memory);
return;
case 0x85:
case 0x95:
case 0x8D:
case 0x9D:
case 0x99:
case 0x81:
case 0x91:
LS_Operations.STA.execute(cpu, memory);
return;
case 0xE6:
case 0xEE:
case 0xF6:
case 0xFE:
Inc_Dec.INC.execute(cpu, memory);
break;
case 0x4C:
case 0x6C:
Jmp_Calls.JMP.execute(cpu, memory);
break;
case 0xEA:
System_Functions.NOP.execute(cpu, memory);
return;
case 0x00:
System_Functions.BRK.execute(cpu, memory);
return;
default:
Console.WriteLine("Unkown Instruction on {0:X4}, Opcode {1:X2}", cpu.PC, memory.getMem(cpu.PC));
System_Functions.NOP.execute(cpu, memory);
return;
}
}
private static void printFirstChunk(MEM memory)
{
Console.WriteLine("First 256 bytes of memory\n");
int limit = 0x00FF + 1;
Console.WriteLine(" 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");
Console.WriteLine(" -----------------------------------------------");
for (int i = 0; i < limit / 16; i++) //pocet riadkov
{
Console.Write("{0:X4}: ", i * 16);
for (int j = 0; j < 16; j++) //riadok
{
Console.Write("{0:X2} ", memory.getMem((ushort)((i * 16) + j)));
}
Console.Write("\n");
}
}
