http://www.cleverscampcamp.com/lamp-blck/

Help on Identifying Computer power supply leads?
I have used lots of salvaged computer power supplies in the past but these have me beaten
ESP group 250-61GN(AMD)
black … ground
red +5
Orange +3.3
Yellow +12
Purp +5Vsb ( what this mean?)
Blue -5V
brown -12v
I have white and green left
I can put a load on red and blck ( filament lamps ) then conect the purple to a red and the load lights but the fan does not run
Which are the power on return lines
I do realise this particular modle needs a load on the black red circuit to run
http://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply
Atari XL/XE – Black Lamp [Atari Corp.] 1989