The device is ideally suited for remote-control keyboard applications because the pull-downs and the interrupt drivers on the port pins allow keyboards to be built without any external components except the keys themselves. There is no need for external pull-up or pull-down resistors, or diodes for wired-OR interrupts, as these features are already designed into the device. This application makes use of many of the device features to control an infra-red television remote control. The application could be very easily modified to control any device with a similar transmission protocol. It will run on any of the `K' devices without modification.