24 lines
939 B
Markdown
24 lines
939 B
Markdown
# PowerNoise
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a fantasy sound chip created by The Beesh-Spweesh! and jvsTSX for the Hexheld fantasy video game console.
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its design employs linear-feedback shift registers (LFSR) for sound generation. this technology is used in many random number generators to produce noise, but it is also capable of producing other tones.
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it has three noise channels and one "slope" channel capable of generating a variety of saw waves.
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it outputs stereo sound with 4-bit volume control per channel and 3-bit master volume control.
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refer to its instrument type's documentation for details on sound synthesis.
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## effect commands
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- `20xx`: **load LFSR value (low byte).**
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- on the slope channel, this sets its accumulator (from `00` to `7F`).
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- `21xx`: **load LFSR value (high byte).**
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- `22xx`: **write to I/O port A.**
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- `23xx`: **write to I/O port B.**
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## info
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this chip uses the [PowerNoise](../4-instrument/powernoise.md) instrument editor.
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