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Texas Instruments SN76477

SN76477 pinout"complex sound generator" is a sound chip produced by Texas Instruments (TI). Thdie blockse chip came to market in 1978, and TI ceased production of the part. A compatible version is identified as ICS76477. 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.

 Reverse Engineering

Wikipedia SN-76477