MirrorRepos/RomWBW
1
0
Fork 1
mirror of https://github.com/wwarthen/RomWBW.git synced 2026-02-06 22:13:13 -06:00
Code Issues Projects Releases Wiki Activity

sound driver: minor doc updates

Browse Source
This commit is contained in:
Dean Netherton
2020-05-02 09:36:40 +10:00
parent b3c044ab65
commit 6cb33ca334
2 changed files with 8 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
Source/Apps/Tune/hbios.inc
View File

@@ -9,7 +9,8 @@ BF_SYSGET .EQU $F8 ; HBIOS: SYSGET function
BF_SND .EQU $50
BF_SNDRESET .EQU BF_SND + 0 ; RESET SOUND SYSTEM
BF_SNDVOL .EQU BF_SND + 1 ; REQUEST SOUND VOL - D IS CHANNEL, E CONTAINS VOLUME (255 MAX, 0 SILENT) - SCALED AS REQUIRED BY DRIVER (EG: MAPS TO JUST 4 BIT RESOLUTION FOR SN76489)
BF_SNDPRD .EQU BF_SND + 2 ; REQUEST SOUND PERIOD - D IS CHANNEL, HL CONTAINS PERIOD (0 LOWEST NOTE) - SCALED BY DRIVER (EG: MAPS TO JUST 10 BITS FOR SN76489 )
BF_SNDVOL .EQU BF_SND + 1 ; REQUEST SOUND VOL - L CONTAINS VOLUME (255 MAX, 0 SILENT) - SCALED AS REQUIRED BY DRIVER (EG: MAPS TO JUST 4 BIT RESOLUTION FOR SN76489)
BF_SNDPRD .EQU BF_SND + 2 ; REQUEST SOUND PERIOD - HL CONTAINS DRIVER SPECIFIC VALUE
BF_SNDNOTE .EQU BF_SND + 3 ; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS QUARTER NOTE
BF_SNDPLAY .EQU BF_SND + 4 ; INITIATE THE REQUESTED SOUND COMMAND
BF_SNDQUERY .EQU BF_SND + 5 ; D IS CHANNEL, E IS SUBCOMMAND
BF_SNDQUERY .EQU BF_SND + 5 ; E IS SUBFUNCTION

6
Source/Doc/Architecture.md
View File

@@ -1374,7 +1374,7 @@ chip provides.
| _Entry Parameters_
| B: 0x52
| C: Audio Device Unit ID
| HL: Period (0000=lowest note, FFFF=highest note)
| HL: Period
| _Returned Values_
| A: Status (0=OK, else error)
@@ -1383,7 +1383,9 @@ This function sets the sound chip period parameter. The period will
be applied when the next SNDPLAY function is invoked.
The period value is a driver specific value. To play standardized
notes, use the SNDNOTE function.
notes, use the SNDNOTE function. A higher value will generate a lower
note. The maximum value that can be used is driver specific. If value
supplied is beyond driver capabilities, register A will be set to $FF.
### Function 0x53 -- Sound Note (SNDNOTE)