The CS4239 is a single chip multimedia audio system that is a pin-compatible upgrade to the CS423xB for many designs. The product includes an integrated FM synthesizer and a Plug-and-Play interface. In addition, the CS4239 includes hardware master volume control pins as well as extensive power management and 3D sound technology. The CS4239 adds a Zoom-Video asynchronous digital serial interface to the industry standard CS423xB. The CS4239 is compatible with the Microsoft Windows Sound System standard and will run software written to the Sound Blaster and Sound Blaster Pro interfaces. The CS4239 is fully compliant with Microsoft's PC '97 and PC '98 audio requirements. ORDERING INFO