Got NetBSD-current to configure 16 bit audio on my Thinkpad 770 now.
Thought the dmesg output would be of interest to others and nice to
have in the mailing list archive or even the NetBSD-laptop pages that
were under construction some time ago:

wss0 at pnpbios0 index 14 (CSC0000)
wss0: io 530-537 388-38b 220-233, irq 5, dma 1 0
wss0: CS4237B
audio0 at wss0: full duplex, mmap

Feico.