OK, I'll add my two cents:

I think of Vdd as two D-cell batteries (so it's positive), and Vss as
[the earth's]Surface, so it's ground - it works for me!

Ron


>As goofy as it sounds, I remember which one is which by thinking
>about how idiotic these designations are. I mean, who really
>thinks that VD is positive?
>
>Seriously, that's how I remember that Vdd is positive.
>
>Andrew
>
>>  I can understand that "pp" in "Vpp" stands for "programming"
>>  in a way, but what does "dd" and "ss" in "Vdd" and "Vss"
>>  stand for ?
>
>
>
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