SID
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Memory Addresses of the FPGA SID in the C256
| address | function |
|---|---|
| $AF:E400 | frequency voice 1 low byte |
| $AF:E401 | frequency voice 1 high byte |
| $AF:E402 | pulse wave duty cycle voice 1 low byte |
| $AF:E403 | pulse wave duty cycle voice 1 high byte |
| $AF:E404 | control register voice 1 |
| $AF:E405 | attack/decay duration voice 1 |
| $AF:E406 | sustain/release duration voice 1 |
| $AF:E407 | frequency voice 2 low byte |
| $AF:E408 | frequency voice 2 high byte |
| $AF:E409 | pulse wave duty cycle voice 2 low byte |
| $AF:E40A | pulse wave duty cycle voice 2 high byte |
| $AF:E40B | control register voice 2 |
| $AF:E40C | attack/decay duration voice 2 |
| $AF:E40D | sustain/release duration voice 2 |
| $AF:E40E | frequency voice 3 low byte |
| $AF:E40F | frequency voice 3 high byte |
| $AF:E410 | pulse wave duty cycle voice 3 low byte |
| $AF:E411 | pulse wave duty cycle voice 3 high byte |
| $AF:E412 | control register voice 3 |
| $AF:E413 | attack/decay duration voice 3 |
| $AF:E414 | sustain/release duration voice 3 |
| $AF:E415 | filter cutoff frequency low byte |
| $AF:E416 | filter cutoff frequency high byte |
| $AF:E417 | filter resonance and routing |
| $AF:E418 | filter mode and main volume control |
| $AF:E419 | paddle x value (not used on C256) |
| $AF:E41A | paddle y value (not used on C256) |
| $AF:E41B | oscillator voice 3 (read only) |
| $AF:E41C | envelope voice 3 (read only) |
| $AF:E41D | not used |
| $AF:E41E | not used |
| $AF:E41F | not used |
