Abstract: A system is described that includes an integrated circuit chip having output paths connected to a network whose electrical of capacitance characteristics can vary. The system includes a circuit for adjusting output drive applied to a pad on the chip. The circuit includes a PVT monitor for providing an output that is related to process, voltage and temperature parameter variations on the chip. A processor determines network configuration information and enables the network's electrical or capacitance characteristics to be determined. The processor is responsive to an output from the PVT monitor and the network's determined electrical characteristics to provide control outputs indicative of a required output drive current level. A drive current circuit includes alterable circuitry and is responsive to the processor's control output to provide the required output drive levels to the pad.