I have a number of 80s and early 90s computers. They had some circuits that used ECL, which required a negative voltage. One I had to recently adjust had a powe

I have a number of 80s and early 90s computers. They had some circuits that used ECL, which required a negative voltage. One I had to recently adjust had a power supply that outputted (when properly adjusted) +5V and -5.2V.