Exactly. There are a couple of small transformers in most supplies that could very well be center-tapped. OR... they could be using a negative 5v DC-DC converter. There are ways of generating -5v without using a transformer. Actually, come to think about it, I would assume that there is a DC-DC converter because of the amperage rating of the -5v line. It is very low. In a symmetric transformer setup, it would be equal to the +5v line in amps.
later
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MeltMan
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