Parallel Port Problems

[David McFarlane]

Max,

Are you sure that you specified a different (& correct) port address 
for the second port?  If you used the same port address for both, 
then you are really using only one of the ports, and that one port 
becomes input or output depending on the last command issued.

-- David McFarlane


At 2/24/2012 12:12 PM Friday, you wrote:
>Dear all,
>
>next problem:
>
>I tried to use two parallel ports, one for sending a trigger for EEG,
>one for input from a self-made device (like a keyboard).
>Sending triggers work until I add a second parallel port ("port mode"
>= Input) to the devices (with second "port mode" = output it works,
>but I need it for input).
>
>Any suggestions?
>
>Max

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