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Yes, you're quite right. The positive supply to the CMOS or NMOS circuits=
=20
is called VDD and the negative or ground VSS or GND. According to=20
"Application-Specific Integrated Circuits" by by Addison Wesley Longman,=20
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=20
connectors marked VDD should be connected to the +5V wires from the ATX=20
PSU.

Cheers,
Anders

****************************************************
Anders Hogrelius, MSc
Senior Exploration Geologist
TM Resources AB (Tumi Resources ltd)
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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!
>
> /~\ The ASCII=09=09=09=09der Mouse
> \ / Ribbon Campaign
> X  Against HTML=09       mouse@rodents.montreal.qc.ca
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