This handles the IOT instruction. We had to do a slightly different model than Prosser & Winkle since the devices are hooked up to the Bus and do not have a direct connection to the AC. Since we need the bus to perform operations like PC=PC+1 the devices could get confused to see the PC when they would expect the AC. There for we assert the IOP lines for only a single clock cycle and latch the incoming data (IOSKIP ACCLR ORAC) with DeviceLatch. The IOP.enable signal allows us to still use Prosser & Winkle's IOPEnabler shift register and we assert IOP.enable when we want the request lines active.