The notes on AS/400 at

	http://www.netbsd.org/Ports/

say "Current models have switched across to the Motorola PowerPC."

Actually, they use proprietary IBM PowerPC chips, with some additional
features that the AS/400 kernel uses, such as tag bits, and some other
extensions as well.

Also, is there an IA-64 port either in existence or in progress?  That
page says nothing about any such port.