mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-23 21:15:11 +00:00
31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
# Famicom Disk System
|
|
|
|
the Famicom Disk System is an expansion device for the Famicom (known as NES outside Japan), a popular console from the '80s.
|
|
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.
|
|
|
|
it also offers an additional 6-bit, 64-byte wavetable sound channel with (somewhat limited) FM capabilities, which is what Furnace supports.
|
|
|
|
# effects
|
|
|
|
- `10xx`: **change wave.**
|
|
- `11xx`: **set modulation depth.**
|
|
- `12xy`: **set modulation speed high byte and toggle on/off.**
|
|
- `x` is the toggle. a value of `1` turns on the modulator.
|
|
- `y` is the speed.
|
|
- `13xx`: **set modulation speed low byte.**
|
|
- `14xx`: **set modulator position.**
|
|
- `15xx`: **set modulator wave.**
|
|
- `xx` points to a wavetable. it should (preferably) have a height of 7 with the values mapping to:
|
|
- 0: +0
|
|
- 1: +1
|
|
- 2: +2
|
|
- 3: +3
|
|
- 4: reset
|
|
- 5: -3
|
|
- 6: -2
|
|
- 7: -1
|
|
- 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)...
|
|
|
|
# info
|
|
|
|
this chip uses the [FDS](../4-instrument/fds.md) instrument editor.
|