Author Topic: Sega of Japan Megadrive sound documents & source code preserved  (Read 162 times)

Offline dink

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Very cool read about the preservation of Sega of Japan's Megadrive sound drivers & documentation for the ym2612 chip.

https://hiddenpalace.org/News/Sega_of_Japan_Sound_Documents_and_Source_Code

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Offline Gab75

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Re: Sega of Japan Megadrive sound documents & source code preserved
« Reply #1 on: June 17, 2020, 04:10:49 PM »
Out of curiosity... the maximum audio-hardware polyphony of Megadrive should be 9 channels (6 FM channels, YM2612, and 3 PSG channels, SN76496)
The PSG has 3 tones generators and 1 noise generator, but this latter haven't a dedicated channel, so it must use a tone generator channel as output.
Am I right?  :S

Offline dink

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Re: Sega of Japan Megadrive sound documents & source code preserved
« Reply #2 on: June 17, 2020, 07:05:11 PM »
Gab75, I'm about mostly sure that the sn76489 has a dedicated noise channel.   :)

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Offline Gab75

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Re: Sega of Japan Megadrive sound documents & source code preserved
« Reply #3 on: June 18, 2020, 01:15:33 AM »
Gab75, I'm about mostly sure that the sn76489 has a dedicated noise channel.   :)

So a total of 10 channels. I thought the SN76489 was a "clone" of AY-3-8910 (the sound chip used in the first generation of MSX and in many arcade games of early 80s), instead it was a similar chip, but not a "clone".
Thanks for clarification! :)