You can include this bit of code in your PsychToolbox script to make sure you have selected the right port of the stimulus PC:
function memento(MEG) % Very simple script to check whether the correct port is selected % % memento must pre preceded by the MEGSynchClass constructor % e.g. % MEG = MEGSynchClass; % memento(MEG) % %alessandro.tomassini@mrc-cbu.cam.ac.uk try MEG.WaitForButtonPress(0.0001) strcmp(MEG.LastButtonPress',MEG.LastButtonPress); catch h=warndlg('Check if NI CARD is selected!'); uiwait(h); end end