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Old 10 August 2015, 14:35   #8
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Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 2,055
Yes, -12V is also needed for audio. It'll still work without it but will be totally distorted. I can't imagine any expansions used it, but the fact that it was on the expansion connector allowed the Mediator board and similar to power the computer (including -12V line) without connecting anything else to the motherboard.
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