ZeriBeep is an accurate SN76489 sound chip emulator.

Features :

    Accurately emulates the SN76489 sound chip, as found in the Acorn BBC Model B/B+/Master.
    Provides a simple 'write byte x to chip' call. All emulation beyond that is taken care of. 

Note that ZeriBeep is not terribly useful on its own. It is meant to be used by emulators that require (or desire) accurate SN76489 emulation. It is currently used by my dedicated Labyrinth emulator (should you want to have a quick listen) and, even more effectively and extensively, in Michael Foot's excellent Acorn BBC Model B/B+/Master emulator BeebIt.