I’ve thought about it, but never really saw much point in it. Typically if I want RB w/ link it’s for dev… so I did RB<->RB. Since almost nobody else has a VB<->PC cable, I figured there wasn’t much point in it unless I wanted it (which I haven’t had a need for yet).
I don’t think I’ll ever add support for Parallel port… only one or two of my computers have a parallel port, there’s probably quite a few people that don’t even have one… the code was very picky about timing, and I don’t even know where my cable is anymore. Not to mention that I don’t really have any desire to link RB to a VB. Once I made the USB one, I pretty much gave up on the Parallel Port one (the USB one is much nicer to work with, as well as being “modern”).
It is probably the cheapest way though… I’ll see if I can dig up some stuff I wrote up on it though (pinouts and stuff).