The
neo driver provides support for the NeoMagic MagicMedia 256AV and 256ZX AC'97 audio devices, found on many laptops.
The MagicMedia 256AV also comes in a variant (usually found on Dell and HP laptops) that works in Windows Sound System emulation mode, not in AC'97 mode. That variant of the chip must be used with the
wss(4) driver. The
neo driver will not attach to such chips.