Also some MB on the PC don't run the right amount of mA on the 5v line
I made the snes controller thing for the paralell port and it won't work cause of the mA but it does work when plugged into my old scanner (even when no power is connected to it a cap on the voltage line maybe?)
You cn try dos version of zsnes as it has a built-in driver for using the controller on the paralell port so you can test it that way or you can check out the byo snes adapter sites as there is a dos test programs which shows you what data is being sent through on what button which is a good test if you can see anything.
Also you must set bi-directional in the bios (it's not set to that as default) that could be the problem check that out first
