Difference between revisions of "SN76489"
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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 [[ | + | 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. |
| − | [[Category: | + | [[Category:Mega Drive Hardware]] |
[[Category:Game Gear Hardware]] | [[Category:Game Gear Hardware]] | ||
[[Category:SMS Hardware]] | [[Category:SMS Hardware]] | ||
Revision as of 14:47, 4 January 2008
File:SN76489.jpg
SN76489 chip
Features of the SN76489 are:
- Three square wave, programmable tone generators
- One programmable white noise generator
- Programmable attenuation
- Mono audio output
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.