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43 lines
1.7 KiB
Markdown
43 lines
1.7 KiB
Markdown
# Virtual Boy
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a "portable" video game console made by Nintendo in the '90's.
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it supposedly was the beginning of virtual reality... nah, instead it failed to sell well because you use it for 15 minutes and then you get a headache.
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its sound generation chip is called Virtual Sound Unit (VSU), a wavetable chip that is a lot like PC Engine, but unlike that, the waves are twice as tall, it doesn't go too low in terms of frequency (~D-2), and the last channel (yep, it has 6 channels) is a noise one.
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additionally, channel 5 offers a modulation/sweep unit. the former is similar to FDS' but has much reduced speed control.
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# effects
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- `10xx`: **set waveform.**
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- `11xx`: **set noise length.** range is `0` to `7`.
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- only in the noise channel.
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- `12xy`: **setup envelope.**
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- `x` determines whether envelope is enabled or not.
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- `0`: disabled
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- `1`: enabled
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- `3`: enabled and loop
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- yeah, the value `2` isn't useful.
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- `y` sets the speed and direction.
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- `0-7`: down
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- `8-F`: up
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- `13xy`: **setup sweep.**
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- `x` sets the speed.
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- `0` and `8` are "speed 0" - sweep is ineffective.
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- `y` sets the shift (`0` to `7`).
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- `8` and higher will mute the channel.
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- only in channel 5.
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- `14xy`: **setup modulation.**
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- `x` determines whether it's enabled or not.
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- 0: disabled
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- 1: enabled
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- 3: enabled and loop
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- 2 isn't useful here either.
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- `y` sets the speed.
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- `0` and `8` are "speed 0" - modulation is ineffective.
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- no, you can't really do Yamaha FM using this.
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- only in channel 5.
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- `15xx`: **set modulation wave.**
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- `xx` points to a wavetable. range is `0` to `FF`.
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- this is an alternative to setting the modulation wave through the instrument.
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