Miles, der Mouse, Anders,

Thanks for clearing this out for me. I still have not got it to work
though - the PSU does not power up when I try to switch it on. I have
checked the connections, (after getting a multimeter), so my suspicion
is that it could have something to do with the PS_ON and/or PWR_OK
connectors. Does anybody know if they do - and how to wire them in
that case?

Cheers,

Emil



On Thu, Oct 25, 2007 at 09:00:39PM +0100, Anders Hogrelius wrote:
> 
> Yes, you're quite right. The positive supply to the CMOS or NMOS circuits 
> is called VDD and the negative or ground VSS or GND. According to 
> "Application-Specific Integrated Circuits" by by Addison Wesley Longman, 
> Inc it should be VDD and VSS in upper case letters rather than Vdd or Vss.
> 
> As the CMOS circuits normally use a +5V supply I'm pretty sure that the 
> connectors marked VDD should be connected to the +5V wires from the ATX 
> PSU.
> 
> Cheers,
> Anders
> 
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> On Thu, 25 Oct 2007, der Mouse wrote:
> 
> >>> - what is "VDD"?
> >> don't know.
> >
> > Almost certainly one of the power supply voltages, more canonically
> > spelled "Vdd".  It's the drain-facing voltage, in much the same sense
> > that in TTL Vcc is the collector-facing voltage.
> >
> > I can't remember offhand what voltage it normally is.
> >
> > And, of course, this is a generic guess; if anyone knows that in this
> > particular context it means something else, please, correct me!
> >
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