private void Initialize()
{
// startup state
Address.IsEnabled = true;
BusAcknowledge.Write(DigitalLevel.High);
Halt.Write(DigitalLevel.High);
IoRequest.Write(DigitalLevel.High);
MemoryRequest.Write(DigitalLevel.High);
MachineCycle1.Write(DigitalLevel.High);
Refresh.Write(DigitalLevel.High);
Read.Write(DigitalLevel.High);
Write.Write(DigitalLevel.High);
}