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37 lines
1.4 KiB
Markdown
37 lines
1.4 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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