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Correct AY38910 Off By 1 Octave Issue

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I think this update corrects a long-standing issue in which the AY38910 driver played notes off by one octave.
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Wayne Warthen
2022-06-20 20:07:06 -07:00
parent 5805f13a62
commit b2e1294452
5 changed files with 103 additions and 63 deletions
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24
Source/Doc/Architecture.md
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@@ -1399,7 +1399,7 @@ If the driver is able to generate the requested note, a success (0) is
returned, otherwise a non-zero error state will be returned.
The sound chip resolution and its oscillator limit the range and
accuracy of the notes played. The typically range of the AY-3-8910
accuracy of the notes played. The typical range of the AY-3-8910
is six octaves, Bb2/A#2-A7, where each value is a unique tone. Values
above and below can still be played but each quarter tone step may not
result in a note change.
@@ -1409,18 +1409,18 @@ to the corresponding octave and note.
| Note | Oct 0 | Oct 1 | Oct 2 | Oct 3 | Oct 4 | Oct 5 | Oct 6 | Oct 7 |
|:----- | -----:| -----:| -----:| -----:| -----:| -----:| -----:| -----:|
| Bb/A# | 0 | 48 | 96 | 144 | 192 | 240 | 288 | 336 |
| C | X | 8 | 56 | 104 | 152 | 200 | 248 | 296 |
| C#/Db | X | 12 | 60 | 108 | 156 | 204 | 252 | 300 |
| D | X | 16 | 64 | 112 | 160 | 208 | 256 | 304 |
| D#/Eb | X | 20 | 68 | 116 | 164 | 212 | 260 | 308 |
| E | X | 24 | 72 | 120 | 168 | 216 | 264 | 312 |
| F | X | 28 | 76 | 124 | 172 | 220 | 268 | 316 |
| F#/Gb | X | 32 | 80 | 128 | 176 | 224 | 272 | 320 |
| G | X | 36 | 84 | 132 | 180 | 228 | 276 | 324 |
| G#/Ab | X | 40 | 88 | 136 | 184 | 232 | 280 | 328 |
| A | X | 44 | 92 | 140 | 188 | 236 | 284 | 332 |
| A#/Bb | 0 | 48 | 96 | 144 | 192 | 240 | 288 | 336 |
| B | 4 | 52 | 100 | 148 | 196 | 244 | 292 | 340 |
| C | 8 | 56 | 104 | 152 | 200 | 248 | 296 | 344 |
| C#/Db | 12 | 60 | 108 | 156 | 204 | 252 | 300 | 348 |
| D | 16 | 64 | 112 | 160 | 208 | 256 | 304 | 352 |
| Eb/D# | 20 | 68 | 116 | 164 | 212 | 260 | 308 | 356 |
| E | 24 | 72 | 120 | 168 | 216 | 264 | 312 | 360 |
| F | 28 | 76 | 124 | 172 | 220 | 268 | 316 | 364 |
| F#/Gb | 32 | 80 | 128 | 176 | 224 | 272 | 320 | 368 |
| G | 36 | 84 | 132 | 180 | 228 | 276 | 324 | 372 |
| Ab/G# | 40 | 88 | 136 | 184 | 232 | 280 | 328 | 376 |
| A | 44 | 92 | 140 | 188 | 236 | 284 | 332 | 380 |
### Function 0x54 -- Sound Play (SNDPLAY)