> Pullups on Vdd and Vss are either pointless or not recommended.
> Other pins depend on the application.

I'd have to slightly disagree there Olin. I used a pull-up on Vss
just a couple of days ago. Short of the usual 8V plug-pack for
my CD's mains adapter, I had to use an unregulated 9V plug-
pack (which floats unloaded at 14V) with a 47R pull-up from
Vss to Vdd

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