Texas Instruments SN76477

[2] The chip is typically used as a sound effects generator in arcade games and toys and for hobby projects.

The use of the SN76477 in a musical context is limited by the fact that it was difficult to electronically control the pitch of the produced sound.

[3] The following quotation summarizes its facilities: [T]he SN76477 generates complex audio signal waveforms by combining the outputs of a low frequency oscillator, variable frequency (voltage controlled) oscillator (VCO) and noise source, modulating the resulting composite signal with a selected envelope and, finally, adjusting the signal's attack and decay periods.

At each stage, the process can be controlled at the programming inputs of the signal modification and generation circuits, using control voltages, logic levels, or different resistor and capacitor values.There were two different sizes of the SN76477 available.

The SN76477N was in a standard 0.6 in (15.24 mm) width dual in-line package (DIP).