a printer oddity

Some of you may already be aware that I have a whole pile of dot-matrix printers kicking around (http://mysite.verizon.net/rtellason/w4s.html has a list of them on there), and in moving some of them yesterday I noticed some rather odd things about one of them. It's an Okidata 391, one of the few that are wide-carriage, and it's 24-pin as well. Where before I'd had most of them facing front-outwards I now have this one sitting there with the rear facing where I can see it, and have noticed a couple of odd things: First is that right next to the usual parallel connection there's another connector, a DB25. That bit seems to be a little loose, and I'm thinking plug-in board maybe? Something's not quite right. Anyhow, I was wondering if this was a serial interface adapter, and if it might be usable in any of the other units I have on hand as well. I have, unfortunately, no documentation on any of these at the present time. The other thing is that attached to that connector is a little adapter, which has an RJ-45 socket on the back side of it. The plug side of it has only a small number of the 25 pins actually installed. If I can figure out a way to pop the shell open maybe I'll trace it out, otherwise I'll probably take the ohmmeter approach. :-) Was it at all common to use these for serial connections? Anybody have docs on those 300-series Okidata printers? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin