Hardware

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The sound controller has 16 channels with configurable replay frequencies, and volume envelope generators. Each channel has two 22-bit pointers to a sample in RAM or ROM, one used for the initial sound trigger and the second used as a loop point. Samples can be either 8-bit or 16-bit unsigned PCM, or Dialogic/OKI ADPCM (VOX).

====== Channels controls ======


^ Address ^ Function                 ^
| 30x0    | Channel X sample address |
| 30x1    | Channel X control (bit 14: 16M, 13-12: ToneMode, 11-6: Loop address segment, 5-0: sample address segment) |
| 30x2    | Channel X loop address   |
| 30x3    | Channel X panning and volume (7 bits each)      |
| 30x4    | Channel X envelope target volume and increment |
| 30x5    | Channel X envelope CNT and EDD (?)              |
| 30x6    | Channel X repeat count (bits 15-9), repeat enable (8), Envelope load (7-0) |
| 30x7    | Channel X IRQ address (15-9), IRQ enable, envelope segment (6-0)           |
| 30x8    | Channel X envelope address                                                 |
| 30x9    | Channel X wave data 0                                                       |
| 30xA    | Channel X ramp down offset (15-9) and envelope address offset (8-0)        |
| 30xB    | Channel X wave data                                                         |
| 32x0    | Phase high bits (2-0)         |
| 32x1    | Phase accumulator high (2-0)  |
| 32x2    | Target phase high (2-0)       |
| 32x3    | Ramp down clock               |
| 32x4    | Phase low bits                |
| 32x5    | Phase accumulator low bits    |
| 32x6    | Target phase low bits         |
| 32x7    | Phase control: time step (15-13), sign (12), offset (11-0)                  |

====== Global controls ======

^ Address ^ Function                                  ^
| 3400    | Channel enable (1 bit per channel)        |
| 3401    | Main volume (7 bits)                      |
| 3402    | Channel FIQ enable                        |
| 3403    | Channel FIQ status                        |
| 3404    | Beat base counter                         |
| 3405    | Beat counter (13-0), IRQ enable (15) and status (14) |
| 3406    | Envelope interval, channels 0-3           |
| 3407    | ... channels 4-7                          |
| 3408    | ... channels 8-11                         |
| 3409    | ... channels 12-15                        |
| 340A    | Envelope fast ramp-down                   |
| 340B    | Channel stop status (1 bit per channel)   |
| 340C    | Zero cross enable (1 bit per channel)     |
| 340D    | Control flags: NoInt (9), LPEn (8), HVol(7-6), SOF (5), Init (3), PCM (2) |
| 340F    | Channels status                           |
| 3410    | Left mixer input                          |
| 3411    | Right mixer input                         |
| 3412    | Left mixer output                         |
| 3413    | Right mixer output                        |
| 3414    | Channel repeat enable (1 bit per channel) |
| 3415    | Channel envelope mode                     |
| 3416    | Channel tone release control              |
| 3417    | Channel envelope IRQ status               |
| 3418    | Channel pitch band enable                 |