Lexmark Lexbook MB10 power suppply question

Hi, I recently found a Lexmark "Lexbook MB10" ... with no docs, no power supply. The back of the computer says the power supply should be 12 V DC, but has no mention of the polarity! Does anyone have this oddball computer, and can they tell me the polarity of the adapter, please? BTW, this Lexbook looks like IBM's answer to the HP Omnibook 425. In web searching, I found several references to other Lexbook models (including the SE10), but none to the MB10. Lexmark's web site was an example of corporate stonewalling (not quite the word I want): since it's obsolete, they have no information on it, and don't even admit (via their search engine) that it might have once existed! Altavista found a single Lexmark.com web page about "Y2K compliance" ...which basically says: hey, it's obsolete, we didn't test it, buy something newer. thanks, Stan Stan Sieler sieler(a)allegro.com www.allegro.com/sieler/wanted/index.html www.allegro.com/sieler