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| − | [[Image:SN76489.jpg|frame|right|SN76489 chip]]The '''SN76489''' is a TTL compatible, 4 channel Programmable Sound Generator (PSG) IC from [[Texas Instruments]]. Its main application has been entertainment and it has been used to provide music and sound effects in [[game console]]s, arcade hardware and home computers. | + | #redirect [[sega:SN76489]] |
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| − | Features of the SN76489 are:
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| − | *Three square wave, programmable tone generators
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| − | *One programmable white noise generator
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| − | *Programmable attenuation
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| − | *Mono audio output
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| − | The frequency of the square waves produced at each channel is derived by two factors: the speed of the external clock and a value provided in a control register for that channel (called N). The eventual frequency is arrived at by dividing the external clock by 32 and then dividing the result by N for each channel. The SN76489 is included 'on-chip' in [[Sega]]'s Video Display Processors (VDP) for their [[Master System]], [[Game Gear]], and [[Mega Drive]] game consoles. The Sega VDP is in fact based on the Texas Instruments [[TMS9918]] VDP.
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| − | [[Category:Mega Drive Hardware]]
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| − | [[Category:Game Gear Hardware]]
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| − | [[Category:Master System Hardware]]
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