man hole covers

Yah. I was wondering if anyone has had any experience with this: You see, I'm trying to interface my IBM System/36 with a City of Chicago Manhole Cover. Has anyone ever installed a manhole cover internally in the System/36, or would I be better off going with a parallel or serial interface? I've had no problems before when I connected the System/36 to a series of sewer grates connected in parallel, but the manhole cover does pose quite a problem. Oh, and one more thing: What's the highest storage capacity of most available manhole covers? I know this has been a heated topic of debate on the list before, and I really don't want to start another manhole cover war, so if anyone knows, just send me a private note. Thanks for the help! - John Higginbotham - limbo.netpath.net