LEGO IR tower cable

So, I"m helping out yet another FIRST lego team. We wanted to get 2 PCs working so we can have more kids programming. I have my old serial IR tower from my original mindstorms kit, but I lost the cable. Does anyone know if the cable is a standard serial (RS-232) cable? The mondstorms program doesn’t seem to be able to use the tower with a RS232 cable from radioshack. Anyone know?

I thought it was a standard male to male serial cable. Sorry im not in miami with my legos cause i might have an extra cable.