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C64: 20xy and 21xy for setting ADSR

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dropping DefleJank
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tildearrow 2023-10-23 13:49:03 -05:00
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doc/7-systems/c64.md
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@ -47,6 +47,7 @@ two versions of aforementioned chip exist - 6581 (original chip) and 8580 (impro
- if `y` is not 0: now
- this effect is not necessary if the instrument's duty macro is absolute.
- `1Exy`: **change additional parameters.**
- _this effect only exists for compatibility reasons, and its use is discouraged._
- `x` may be one of the following:
- `0`: attack (`y` from `0` to `F`)
- `1`: decay (`y` from `0` to `F`)
@ -55,6 +56,12 @@ two versions of aforementioned chip exist - 6581 (original chip) and 8580 (impro
- `4`: ring modulation (`y` is `0` or `1`)
- `5`: oscillator sync (`y` is `0` or `1`)
- `6`: disable channel 3 (`y` is `0` or `1`)
- `20xy`: **set attack/decay.**
- `x` is the attack.
- `y` is the decay.
- `21xy`: **set sustain/release.**
- `x` is the sustain.
- `y` is the release.
- `3xxx`: **set duty cycle.** `xxx` range is `000` to `FFF`.
- `4xxx`: **set cutoff.** `xxx` range is `000` to `7FF`.