Presumably the seller of my adapter had no clue about basic electricity. Errr.... that's the live and that's the neutral? Nevermind that a computer power supply has more than one live. There's 3.3, 5, and 12V at least.
I'm not sure what you mean, this was an unused pin marked 5V that was later used for 12? And I thought the spectrum was 9V? Did it boost to 12 somewhere inside?