PSG Register R10
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The envelope shape/cycle control is contained in the lower 4 bits of register R10. Each of these 4 bits controls a function in the PSG Envelope Generator:
- b3: Continue
- b2: Attack
- b1: Alternate
- b0: Hold
Note: The envelope is reseted each time R10 is overwritten (even if it's with the same value).
Below are the different possible shapes, according to R10 bits:
| R10 bits | Envelope generator output |
|---|---|
| 00xx |  |
| 01xx |  |
| 1000 |  |
| 1001 |  |
| 1010 |  |
| 1011 |  |
| 1100 |  |
| 1101 |  |
| 1110 |  |
| 1111 |  |
