I recently built a parallel link, but It onlly worked on my computer for a short period of time, but it worked on older, slower ones. But now it has stopped working on all of those as well... I've re-built it over and over, checked conections.. but the same thing. I tried building the 4$ serial link (schem. attached).... but it never worked either.. I check it over and over too, swapped parts, etc. If anyone has any suggestions, or any modifications I should make to the stuff (ie. different parts) let me know