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The Texas Instruments SN76489 is a programmable sound generator chip from the 1980s, 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. Competing with the General Instrument AY-3-8910, 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.