The man page for config(8) and the source don't seem to have much
in the way of notes about changes from the version documented in
the smm.  The grammar for "config netbsd swap on sd0b and sd1b" for
example, seems to have been removed.  How does NetBSD/Alpha handle
configuring swap devices?

When I try to swapon sd1b, it says "device not configured", so I know
the kernel is still looking :-).

Did someone decide to hardwire swap generic and that swapping on a second
device was a loss?