DECmate-III questions

I just recieved a few DECmate III "motherboards" which are supposedly functional (the guy is selling more of them on eBay right now, for their Intersil 6120 chips). Before I attempt to desolder the chip, does anyone have information on these things? I'm looking for information on what each of the connectors is, and the pinout of the power connector (J2) and kb/video connector (J5?). Also, any manuals or images of software disks for this thing would be nice : ). Here's what the connectors are labelled on my board: J1 and J? (can't see a label for that one) are 34pin headers, and I'm guessing go to RX50s, J3 is probably the 'expansion connector', J6 and J4 are serial(?) and J5 is the video/kb (?). I'm fairly certain that J2 is power, but don't know what its pinout is without playing with my DMM... but I'd rather get it right the first time and *not* smoke the board... Btw, J? hangs off of the side of the board, and is a right-angle header, unlike all the rest of the connectors. +------------------------------------------+ | ______J6______ ____J5____ ___J4__ | | \___DB25P____/ /___DA15P__\ \_DE9P/ | | _____________ +-+ | | |__34pin hdr__| |'| | | J1 |:| | | |:|J| | |:|2| | |:| | | +------------+ +-+ | | | | +--+ | | E30 | | | | | DC382 | | |J? | | | | | | +------------+ | | | +--+ | +------------+ __ | | | | | | | | | E25 | | | | | | DC381 | ___ | |J| | | | | 6 | | |3| | +------------+ | 1 | | | | | | 2 | | | | | | 0 | |_| | | |___| | | | +------------------------------------------+ -- Purdue University ITAP/RCS Information Technology at Purdue Research Computing and Storage http://www.itap.purdue.edu/rcs/