Matt Mc_Carthy wrote in a message to MIKE ROSS:

 MMC> Thre only IC's in PC PSs is the optoisolator which is fed from the
 MMC> overvoltage crowbar to kill the switcher.

Eh?  The one ATX supply I've been messing with here uses one of those 494
PWM chips...

 MMC> There were a few in the middle years of the AT PS which used a PWM
 MMC> chip in an attempt at current regulation, but that trend died
 MMC> pretty quick. .......................

What are they using,  then?

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