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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 ...
English: A technical drawing displaying the pin configuration on a Texas Instruments SN76489 programmable sound generator (PSG). This SVG file was created by me, User:Crotalus horridus , in Notepad ; as a basis, I used some of my older diagrams of other chips, which were also released under free licenses.
Pin 9 is the ‘system enable’ pin for the 76477, if open the sound generator is off. If pin 9 is connected to ground, the sound generator is running. Both switches are included for that reason. SW17 (toggle or momentary) is the switch that enables the internal noise generator clock.
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A circuit diagram (or: wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components and interconnections of the circuit using standardized symbolic representations.