28 lines
878 B
Markdown
28 lines
878 B
Markdown
# Yamaha YM2612
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one of two chips that powered the Sega Genesis. It is a six-channel, four-operator FM synthesizer. Channel #6 can be turned into 8-bit PCM player.
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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 mutliplier.
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- `17xx`: enable PCM channel.
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- this only works on channel 6.
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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 system.
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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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