Difference between revisions of "SN76489"
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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 consoles, arcade hardware and home computers. | + | ''For information on how to use the PSG chip, see [[PSG]].'' |
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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 consoles, arcade hardware and home computers. | ||
Features of the SN76489 include: | Features of the SN76489 include: | ||
Revision as of 12:39, 21 August 2012
For information on how to use the PSG chip, see PSG.
SN76489 chip
Features of the SN76489 include:
- Three programmable square wave 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.
