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 Writing and Reading from parallel ports with Matlab psychtoolbox: 
 Psychtoolbox Wiki
 Additional Instructions
 PortTalk download (this is already installed on the STIM pc)


 %MATLAB example

 %PC stim port definition
 PCport1 = hex2dec('378');  % &H378  % 888
 PCport2 = hex2dec('BCE1'); % &HBCE1 % 48353
 PCport3 = hex2dec('BCF1'); % &HBCF1 % 48369

 %SEND triggers (e.g. from 1 to 255)
 %open the acquisition software and look at the triggers on the 
 %STI00X lines and STI101
 for i = 1:255
   lptwrite(PCport1, i); % send trigger
   WaitSecs(0.005);      % wait 5 ms
   lptwrite(PCport1, 0); % reset port
 end

 %CHECK button presses
 respkey = 0;
 while respkey == 0;
    respkey =lptread(1+PCport1);
 end