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Hi Michael,

> Other than inserting the line ".set WANT_TWI = 1" into the main
> project file, is there something else that needs to be done to get
> the I2C capability?

I use the amforth-shell for such tasks, it substitutes (if
properly installed) the register names with their numbers on
the fly. The/most WANT-Options I consider legacy stuff ;)

> I insert that line, compile and flash the Uno, but when I look for
> the declarations of TWBR, etc., I don't find them.  Perhaps
> there's a specific location this needs to be inserted in the
> project file?

Look at core/devices/<controller> directory. All controller specific
things are there.

Matthias

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