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That makes sense, I understand now. I definitely would prefer having one single psu for both -16 and +16, unfortunately, I didn't find any psu with multiple outputs where -15/+15 can be adjusted to -16/+16 without external stuff.
John uses the meanwell T60C (http://s100computers.com/My%20System%20Pages/The%20Box/The%20Box.htm#The_Power_Supply), I'm wondering how he stepped the -15/+16 up to -16/+16, or maybe  using -15/+15 is fine on the S100 bus? (the voltage regulators on the cards would work fine with -15/+15??)
If I use two separate PSUs, does the -16 PSU need to be as big as the +16? When I look at the photo David Fry posted (http://n8vem-sbc.pbworks.com/w/file/76170281/psu_detail.jpg), it seems that the -16V comes from a much smaller PSU than the +16.