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[on:]

I need a uno-ish broad running @ 20MHz to run at 16MHz.

Would changing this in Boards.txt work?

Code:

##############################################################

orangutan328p.name=Pololu 3pi robot w/ ATmega328p via Programmer
orangutan328p.upload.using=avrispv2
orangutan328p.upload.maximum_size=32768
orangutan328p.build.mcu=atmega328p
orangutan328p.build.f_cpu=20000000L
orangutan328p.build.core=arduino

to this?

Code:

##############################################################

orangutan328p.name=Pololu 3pi robot w/ ATmega328p via Programmer
orangutan328p.upload.using=avrispv2
orangutan328p.upload.maximum_size=32768
orangutan328p.build.mcu=atmega328p
orangutan328p.build.f_cpu=16000000L   // <<<< edited here
orangutan328p.build.core=arduino

[Reply #1 on:]

Assuming the crystal is changed to match, yes.

[Reply #2 on:]

You need to change the boot loader as well.