public void executeInstruction(Instruction instr)
{
if (instr == null) {
Console.WriteLine("Non-existant instruction; skipping");
programCounter++;
return;
}
List<byte> operands = new List<byte>();
for (int i = 1; i < instr.length; i++) {
operands.Add(readHighNibble(assembly[programCounter + i]));
operands.Add(readLowNibble(assembly[programCounter + i]));
}
if (instr.opcode != 0xA) {
instr.execute(ms, operands.ToArray());
programCounter += currentInstruction.length;
} else {
programCounter = instr.execute(ms, operands.ToArray(), programCounter);
}
}
public void loadAssembly()
{
//currentInstruction = instructions.Where(i => i.opcode == readLowNibble(assembly[0]) && i.cond == readHighNibble(assembly[1])).First();
currentInstruction =
instructions.First(i => i.accept(readHighNibble(assembly[0]), readLowNibble(assembly[0])));
}
public Instruction fetchAndDecodeInstruction()
{
int high = readHighNibble(assembly[programCounter]);
int low = readLowNibble(assembly[programCounter]);
currentInstruction = instructions.FirstOrDefault(instr => instr.accept(high, low)) ?? new Instruction();
return currentInstruction;
}