⁸The Pstar simulation times for the 169 bias conditions were now about ten times longer using the neural network behavioural model compared to using the built-in MOST model 901 in Pstar. This may be due to inefficiencies in the handling of the input language of Pstar, onto which the neural network was mapped. This is indicated by the fact that the simulation time for the neural model in the neural modelling program itself was instead about four times shorter than with the MOST model 901 model in Pstar, on the same HP9000/735 computer. However, as was explained in section 1.1, in device modelling the emphasis is less on simulation efficiency and more on quickly getting a model that is suitable for accurate simulation. Only in this particular test-case there already was a good physical model available, which we even used as the source of data to be modelled. Nevertheless, a more efficient input language handling in Pstar might lead to a significant gain in simulation speed.