MirrorRepos/RomWBW
1
0
Fork 1
mirror of https://github.com/wwarthen/RomWBW.git synced 2026-02-06 14:11:48 -06:00
Code Issues Projects Releases Wiki Activity

Audio driver updates

Browse Source
This commit is contained in:
b1ackmai1er
2020-05-23 23:23:45 +08:00
parent a3a03f2851
commit b015cecb2a
4 changed files with 166 additions and 59 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
Source/Doc/Architecture.md
View File

@@ -1429,23 +1429,32 @@ Increase by steps of 48 to select the same note in next octave.
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
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.
The following table shows the mapping of the input value in HL
to the corresponding octave and note.
| Note | Octave 0 | Octave 1 | Octave 2 | Octave 3 | Octave 4 | Octave 5 | Octave 6 |
|-------|----------|----------|----------|----------|----------|----------|----------|
| Bb/A# | 0 | 48 | 96 | 144 | 192 | 240 | 288 |
| B | 4 | 52 | 100 | 148 | 196 | 244 | 292 |
| C | 8 | 56 | 104 | 152 | 200 | 248 | 296 |
| C#/Db | 12 | 60 | 108 | 156 | 204 | 252 | 300 |
| D | 16 | 64 | 112 | 160 | 208 | 256 | 304 |
| Eb/D# | 20 | 68 | 116 | 164 | 212 | 260 | 308 |
| E | 24 | 72 | 120 | 168 | 216 | 264 | 312 |
| F | 28 | 76 | 124 | 172 | 220 | 268 | 316 |
| F#/Gb | 32 | 80 | 128 | 176 | 224 | 272 | 320 |
| G | 36 | 84 | 132 | 180 | 228 | 276 | 324 |
| Ab/G# | 40 | 88 | 136 | 184 | 232 | 280 | 328 |
| A | 44 | 92 | 140 | 188 | 236 | 284 | 332 |
+-------------------------------------------------------+
| | OCTAVE |
| Note |-----------------------------------------------+
| | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|-------|-----|-----|-----|-----|-----|-----|-----|-----+
| Bb/A# | 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)
@@ -1529,9 +1538,6 @@ key aspects of the specific Audio Device.
Reports information about the audio device unit specified.
At this stage, only one driver type is supported (SN76489), but is
envisaged that more will be added in the future.
Register B reports the audio device type (see below).
Registers HL and DE contain relevant port addresses for the hardware
@@ -1543,7 +1549,7 @@ AUDIO ID | Value | Device | Returned registers
-------------- | ----- | ---------- | --------------------------------------------
SND_SN76489 | 0x01 | SN76489 | E: Left channel port, L: Right channel port
SND_AY38910 | 0x02 | AY-3-8910 | D: Address port, E: Data port
SND_BITMODE | 0x03 | I/O PORT | D: Address port, E: Bit mask
`\clearpage`{=latex}