The Texas Instruments SN76489 is a programmable sound generator chip released in 1979, used to create music and sound effects on computers and video game systems. Initially developed by Texas Instruments for its TI-99/4A home computer, it was later updated and widely adopted in systems like the BBC Micro, ColecoVision, IBM PCjr, Sega's Master System and Game Gear, and the Tandy 1000. The SN76489 offered three tone generators for musical notes and a noise generator for sound effects like static and explosions, all with adjustable frequencies and volume levels. It competed with the General Instrument AY-3-8910; it lacked some of the 8910's more advanced features, like an envelope generator, but was inexpensive and easy to implement. TI had released the more powerful Texas Instruments SN76477 in 1978, but this was difficult to implement and did not see widespread use.

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