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27 lines
1.1 KiB
Markdown
27 lines
1.1 KiB
Markdown
# Famicom Disk System
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the Famicom Disk System is an expansion device for the Famicom (known as NES outside Japan), a popular console from the '80's.
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as it name implies, it allowed people to play games on specialized floppy disks that could be rewritten on vending machines, therefore reducing the cost of ownership and manufacturing.
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it also offers an additional 6-bit, 64-byte wavetable sound channel with (somewhat limited) FM capabilities, which is what Furnace supports.
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# effects
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- **`10xx`**: change wave.
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- **`11xx`**: set modulation depth.
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- **`12xy`**: set modulation speed high byte and toggle on/off.
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- `x` is the toggle. a value of 1 turns on the modulator.
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- `y` is the speed.
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- **`13xx`**: set modulation speed low byte.
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- **`14xx`**: set modulator position.
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- **`15xx`**: set modulator wave.
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- `xx` points to a wavetable. it should (preferably) have a height of 7 with the values mapping to:
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- 0: +0
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- 1: +1
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- 2: +2
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- 3: +3
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- 4: reset
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- 5: -3
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- 6: -2
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- 7: -1
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- why is this mapping so unnatural? because that's how DefleMask does it (yeah, as you may have guessed this effect is mostly for compatibility reasons)...
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