I've been asked if I could get hold of one of these cables for the Mega Drive to enable two-player link-up on Zero Tolerance but to be honest, I've never even heard of it. My copy of the game says there's an offer card (long gone from my copy) by which you presumably get a cable from Accolade via mail order.
Are these things easy to get hold? Maybe it's a standard off-the-shelf cable I can buy? Any ideas?