In a message dated 22/12/97  22:17:44, you write:

<< Up to a point, the larger the load on the 5V line, the better the 12V
 output will work.  If your application needs primarily 12V, and very
 little or no 5V, it's possible to modify the supply so it regulates via
 the 12V output.  This is rather advanced though.
  >>
Now come on the regulation in a PC power supply is nearly always controled
with a TL431 programable zener its simply a matter of tracing the resistor
from the control pin to +5v read its value and scale it to 12v (the pin needs
2.5v) Let ohms law apply..........
Componants required 1 0.25w Resistor cost approaching nil.

Cheers Steve...............
Merry kristmooose (oops beer again)