sd:appendix_3_sound_system
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Table of Contents
Appendix 4 Sound System
Sound System Memory Map
Also see Appendix 3 Memory Map.
Sound System ($01EF80–$01EFBF) – 64 bytes total
| Address Range | Size | Symbol / Register | Description |
|---|---|---|---|
| $01EF80–$01EF8F | 16 bytes | SOUND0_BASE | Voice 0 – Complete voice channel (SID-like voice 0) |
| $01EF80 | 1 byte | SOUND0_FREQ_LO | Frequency low byte (bits 7–0) |
| $01EF81 | 1 byte | SOUND0_FREQ_HI | Frequency high byte (bits 15–8) |
| $01EF82 | 1 byte | SOUND0_GATE | Gate / Waveform select (gate bit + waveform type: noise, pulse, saw, triangle, etc.) |
| $01EF83 | 1 byte | SOUND0_VOLUME | Master volume for voice 0 (usually 0–15, may include global volume in some implementations) |
| $01EF84 | 1 byte | SOUND0_ATTACK | Attack rate (0–15) |
| $01EF85 | 1 byte | SOUND0_DECAY | Decay rate (0–15) |
| $01EF86 | 1 byte | SOUND0_SUSTAIN | Sustain level (0–15) |
| $01EF87 | 1 byte | SOUND0_RELEASE | Release rate (0–15) |
| $01EF88 | 1 byte | SOUND0_DATA1 | Voice-specific control / extra parameter 1 (e.g. pulse width low, filter routing, etc.) |
| $01EF89 | 1 byte | SOUND0_DATA2 | Voice-specific control / extra parameter 2 (e.g. pulse width high, ring/mod flags, etc.) |
| $01EF8A–$01EF8F | 6 bytes | — | Reserved / unused / future expansion for Voice 0 |
| $01EF90–$01EF9F | 16 bytes | SOUND1_BASE | Voice 1 – Complete voice channel (SID-like voice 1) |
| $01EF90 | 1 byte | SOUND1_FREQ_LO | Frequency low byte |
| $01EF91 | 1 byte | SOUND1_FREQ_HI | Frequency high byte |
| $01EF92 | 1 byte | SOUND1_GATE | Gate / Waveform select |
| $01EF93 | 1 byte | SOUND1_VOLUME | Volume for voice 1 |
| $01EF94 | 1 byte | SOUND1_ATTACK | Attack rate |
| $01EF95 | 1 byte | SOUND1_DECAY | Decay rate |
| $01EF96 | 1 byte | SOUND1_SUSTAIN | Sustain level |
| $01EF97 | 1 byte | SOUND1_RELEASE | Release rate |
| $01EF98 | 1 byte | SOUND1_DATA1 | Extra control 1 |
| $01EF99 | 1 byte | SOUND1_DATA2 | Extra control 2 |
| $01EF9A–$01EF9F | 6 bytes | — | Reserved / unused / future expansion for Voice 1 |
| $01EFA0–$01EFAF | 16 bytes | SOUND2_BASE | Voice 2 – Complete voice channel (SID-like voice 2) |
| $01EFA0 | 1 byte | SOUND2_FREQ_LO | Frequency low byte |
| $01EFA1 | 1 byte | SOUND2_FREQ_HI | Frequency high byte |
| $01EFA2 | 1 byte | SOUND2_GATE | Gate / Waveform select |
| $01EFA3 | 1 byte | SOUND2_VOLUME | Volume for voice 2 |
| $01EFA4 | 1 byte | SOUND2_ATTACK | Attack rate |
| $01EFA5 | 1 byte | SOUND2_DECAY | Decay rate |
| $01EFA6 | 1 byte | SOUND2_SUSTAIN | Sustain level |
| $01EFA7 | 1 byte | SOUND2_RELEASE | Release rate |
| $01EFA8 | 1 byte | SOUND2_DATA1 | Extra control 1 |
| $01EFA9 | 1 byte | SOUND2_DATA2 | Extra control 2 |
| $01EFAA–$01EFAF | 6 bytes | — | Reserved / unused / future expansion for Voice 2 |
| $01EFB0–$01EFBF | 16 bytes | SOUND3_BASE | Voice 3 – Complete voice channel (SID-like voice 3) |
| $01EFB0 | 1 byte | SOUND3_FREQ_LO | Frequency low byte |
| $01EFB1 | 1 byte | SOUND3_FREQ_HI | Frequency high byte |
| $01EFB2 | 1 byte | SOUND3_GATE | Gate / Waveform select |
| $01EFB3 | 1 byte | SOUND3_VOLUME | Volume for voice 3 |
| $01EFB4 | 1 byte | SOUND3_ATTACK | Attack rate |
| $01EFB5 | 1 byte | SOUND3_DECAY | Decay rate |
| $01EFB6 | 1 byte | SOUND3_SUSTAIN | Sustain level |
| $01EFB7 | 1 byte | SOUND3_RELEASE | Release rate |
| $01EFB8 | 1 byte | SOUND3_DATA1 | Extra control 1 |
| $01EFB9 | 1 byte | SOUND3_DATA2 | Extra control 2 |
| $01EFBA–$01EFBF | 6 bytes | — | Reserved / unused / future expansion for Voice 3 |
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