In our experience, we have not found a USB-LPT cable that actually works for this. The reason is because these adapters use a different protocol compared to a true LPT COM port. We have only ever gotten that to work by buying a PCI-Parallel Port (LPT) card and installing it on the computer (which means you can’t use a laptop since they won’t have PCI slots). These cards are only around $15 USD or so.
Other options are to use something like the Cederus system (https://www.cedrus.com/stimtracker/index.htm), which you can get from NIRx.
However since NIRS doesn’t need the timing to be too exact, you can use other solutions. We have a LabStreamingLayer driver and examples for Eprime that will work with the BrainVision system (https://github.com/huppertt/EprimeLSL_sync). We have also made our own USB stimulus adapters with Arduino cards (http://huppertlab.net/2018/11/21/creating-usb-analog-sync-box-with-arduino-uno/), which works because NIRS is fine with a few hundred millisecond time delays, but this would not work with EEG.
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