38 lines
1.5 KiB
Markdown
38 lines
1.5 KiB
Markdown
# Sega Genesis/Mega Drive
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a video game console that showed itself as the first true rival to Nintendo's video game market near-monopoly in the US during the '80's.
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this console is powered by two sound chips: the [Yamaha YM2612](ym2612.md) and [a derivative of the SN76489](sms.md).
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# effects
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- **`10xy`**: set LFO parameters.
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- `x` toggles the LFO.
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- `y` sets its speed.
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- **`11xx`**: set feedback of channel.
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- **`12xx`**: set operator 1 level.
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- **`13xx`**: set operator 2 level.
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- **`14xx`**: set operator 3 level.
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- **`15xx`**: set operator 4 level.
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- **`16xy`**: set multiplier of operator.
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- `x` is the operator (1-4).
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- `y` is the multiplier.
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- **`17xx`**: enable PCM channel.
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- this only works on channel 6.
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- **this effect is there for compatibility reasons** - it is otherwise recommended to use Sample type instruments (which automatically enable PCM mode when used).
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- **`18xx`**: toggle extended channel 3 mode.
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- 0 disables it and 1 enables it.
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- only in extended channel 3 chip.
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- **`19xx`**: set attack of all operators.
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- **`1Axx`**: set attack of operator 1.
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- **`1Bxx`**: set attack of operator 2.
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- **`1Cxx`**: set attack of operator 3.
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- **`1Dxx`**: set attack of operator 4.
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- **`20xy`**: set PSG noise mode.
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- `x` controls whether to inherit frequency from PSG channel 3.
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- 0: use one of 3 preset frequencies (C: A-2; C#: A-3; D: A-4).
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- 1: use frequency of PSG channel 3.
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- `y` controls whether to select noise or thin pulse.
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- 0: thin pulse.
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- 1: noise.
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