mirror of
https://github.com/tildearrow/furnace.git
synced 2024-12-02 17:27:25 +00:00
105 lines
5 KiB
Markdown
105 lines
5 KiB
Markdown
# Yamaha OPL
|
|
|
|
a series of FM sound chips which were very popular in DOS land. it was so popular that even Yamaha made a logo for it!
|
|
|
|
essentially a downgraded version of Yamaha's other FM chips, with only 2 operators per channel.
|
|
however, it also had a [drums mode](opll.md), and later chips in the series added more waveforms (than just the typical sine) and even a 4-operator mode.
|
|
|
|
the original OPL (Yamaha YM3526) was present as an expansion for the Commodore 64 and MSX computers (erm, a variant of it). it only had 9 two-operator channels and drums mode.
|
|
|
|
Y8950 is essentially the same chip, but with one additional channel for ADPCM sample playback, behaving in a similar way as the one found in YM2608.
|
|
|
|
its successor, the OPL2 (Yamaha YM3812), added 3 more waveforms and was one of the more popular chips because it was present on the AdLib card for PC.
|
|
later Creative would borrow the chip to make the Sound Blaster, and totally destroyed AdLib's dominance.
|
|
|
|
the OPL3 (Yamaha YMF262) added 9 more channels, 4 more waveforms, rudimentary 4-operator mode (pairing up to 12 channels to make up to six 4-operator channels), quadraphonic output and some other things.
|
|
|
|
the OPL4 (Yamaha YMF278) retains the FM block from OPL3, but adds 24 sample channels on top! samples are 44100 Hz, can be between 8, 12 or 16-bit, stereo (with 16 different levels) and can read PCM data from ROM or SRAM (up to 4 MB).
|
|
|
|
afterwards everyone moved to Windows and software mixed PCM streaming...
|
|
|
|
## effects
|
|
|
|
- `10xx`: **set AM depth.** the following values are accepted:
|
|
- `0`: 1dB (shallow)
|
|
- `1`: 4.8dB (deep)
|
|
- this effect applies to all channels.
|
|
- `11xx`: **set feedback of channel.**
|
|
- `12xx`: **set operator 1 level.**
|
|
- `13xx`: **set operator 2 level.**
|
|
- `14xx`: **set operator 3 level.**
|
|
- only in 4-op mode (OPL3 and OPL4).
|
|
- `15xx`: **set operator 4 level.**
|
|
- only in 4-op mode (OPL3 and OPL4).
|
|
- `16xy`: **set multiplier of operator.**
|
|
- `x` is the operator (1-4; last 2 operators only in 4-op mode).
|
|
- `y` is the new MULT value..
|
|
- `17xx`: **set vibrato depth.**
|
|
- `0`: normal
|
|
- `1`: double
|
|
- this effect applies to all channels.
|
|
- `18xx`: **toggle drums mode.**
|
|
- `0` disables it and `1` enables it.
|
|
- only in drums chip.
|
|
- `19xx`: **set attack of all operators.**
|
|
- `1Axx`: **set attack of operator 1.**
|
|
- `1Bxx`: **set attack of operator 2.**
|
|
- `1Cxx`: **set attack of operator 3.**
|
|
- only in 4-op mode (OPL3).
|
|
- `1Dxx`: **set attack of operator 4.**
|
|
- only in 4-op mode (OPL3).
|
|
- `2Axy`: **set waveform of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` is the value.
|
|
- only in OPL2 or higher.
|
|
- `30xx`: **enable envelope hard reset.**
|
|
- this works by inserting a quick release and tiny delay before a new note.
|
|
- `50xy`: **set AM of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` determines whether AM is on.
|
|
- `51xy`: **set SL of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` is the value.
|
|
- `52xy`: **set RR of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` is the value.
|
|
- `53xy`: **set VIB of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` determines whether VIB is on.
|
|
- `54xy`: **set KSL of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` is the value.
|
|
- `55xy`: **set SUS of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` determines whether SUS is on.
|
|
- `56xx`: **set DR of all operators.**
|
|
- `57xx`: **set DR of operator 1.**
|
|
- `58xx`: **set DR of operator 2.**
|
|
- `59xx`: **set DR of operator 3.**
|
|
- only in 4-op mode (OPL3).
|
|
- `5Axx`: **set DR of operator 4.**
|
|
- only in 4-op mode (OPL3).
|
|
- `5Bxy`: **set KSR of operator.**
|
|
- `x` is the operator from 1 to 4; the last 2 operators only work in 4-op mode. a value of `0` means "all operators".
|
|
- `y` determines whether KSR is on.
|
|
|
|
## info
|
|
|
|
these chips use the [FM (OPL)](../4-instrument/fm-opl.md) instrument editor. Y8950 ADPCM uses [Generic Sample](../4-instrument/sample.md) and [ADPCM-B](../4-instrument/adpcm-b.md) instrument editors.
|
|
|
|
when two channels are joined for 4-op mode, the channel bar will show `4OP` on a bracket tying them together.
|
|
|
|
## chip config
|
|
|
|
the following options are available in the Chip Manager window:
|
|
|
|
- **Clock rate**: sets the rate at which the chip will run.
|
|
|
|
additionally, in OPL3:
|
|
|
|
- **Chip type**: sets the chip model. OPL3-L uses resampling.
|
|
- **Compatible panning**: for compatibility with old Furnace.
|
|
|
|
additionally, in OPL4:
|
|
|
|
- **RAM Size**: sets the RAM size for sample storage
|