BIOS Sound Functions - Revision history

ColinPitrat: /* Set Tone Envelope */ This byte has 8 bits

2021-04-22T06:25:31Z

‎Set Tone Envelope: This byte has 8 bits

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ColinPitrat: /* Set Volume Envelope */ Precise bit7 content

2021-04-22T06:20:52Z

‎Set Volume Envelope: Precise bit7 content

ColinPitrat: /* Set Volume Envelope */ Bit 7 is for hw/sw envelope

2021-04-22T06:19:44Z

‎Set Volume Envelope: Bit 7 is for hw/sw envelope

MacDeath at 16:41, 19 December 2010

2010-12-19T16:41:32Z

Nocash: Created page with '== Output to Sound Queue == BCAA SOUND_QUEUE (output sound) ;in: HL=data ;ch,env,ent,freq(lo,hi,noise),vol,len(lo,hi) In: HL=Pointer to 9-byte Data Block 0 Channel (Bit0-2=C…'

2010-01-24T22:07:33Z

Created page with '== Output to Sound Queue == BCAA SOUND_QUEUE (output sound) ;in: HL=data ;ch,env,ent,freq(lo,hi,noise),vol,len(lo,hi) In: HL=Pointer to 9-byte Data Block 0 Channel (Bit0-2=C…'

New page

== Output to Sound Queue ==
BCAA SOUND_QUEUE (output sound) ;in: HL=data ;ch,env,ent,freq(lo,hi,noise),vol,len(lo,hi)
In: HL=Pointer to 9-byte Data Block
0 Channel (Bit0-2=ChannelA-C, Bit3-5=RendevousA..C, Bit6=Hold, Bit7=Flush)
1 ENV Volume Envelope (1..15, or 0=none)
2 ENT Tone Envelope (1..15, or 0=none)
3 Tone Frequency, lower 8bit (000h=none)
4 Tone Frequency, upper 4bit
5 Noise Frequency (01h..1Fh, or 00h=none) ;shared for all 3 channels
6 Volume (00h..0Fh)
7 Duration, lower 8bit (in 1/100 seconds) ;\0=endless/until end of ENV?
8 Duration, upper 8bit ;/negative=repeat ENV -N times?
Out: CY=1=okay, CY=0=Queue Full.
Equivalent to BASIC's "SOUND".

== Set Volume Envelope ==
BCBC SOUND_SET_ENV
In: A=Envelope number (1..15), HL=Pointer to Data (must be >3FFFh)
The data block starts with a header byte:
bit7-0 number of following 3-byte parameters (1..5)
The following 3-byte parameters can be (when Byte 0, Bit7=0):
Byte 0 Number of steps (01h..7Fh)
Byte 1 Step (-80h..+7Fh) (of which, only -0Fh..+0Fh makes sense)
Byte 2 Duration per step (in 1/100 seconds) (01h..FFh, or 00h=100h)
Or, using the (less comfortable) hardware envelope (when Byte 0, Bit7=1):
Byte 0 PSG Envelope Shape (00h..0Fh), plus 80h ;PSG Register 0Dh
Byte 1 PSG Envelope Frequency, upper 8bit ;PSG Register 0Ch
Byte 2 PSG Envelope Frequency, lower 8bit ;PSG Register 0Bh
Equivalent to BASIC's "ENV".
The initial sound volume is SOUND_QUEUE's [HL+6]. Note that the step is added to the sound volume (there's NO separate envelope volume register, multiplied with the sound volume). Take care that the volume doesn't overflow/underflow.

== Set Tone Envelope ==
BCBF SOUND_SET_ENT
In: A=Envelope number (1..15), HL=Pointer to Data (must be >3FFFh)
The data block starts with a header byte:
bit7 repeat flag (0=one shot, 1=repeat envelope)
bit6-0 number of following 3-byte parameters (1..5)
The following 3-byte parameters can be (when Byte 0 is <F0h):
Byte 0 Number of steps (01h..EFh)
Byte 1 Step (-80h..+7Fh)
Byte 2 Duration per step (in 1/100 seconds) (01h..FFh, or 00h=100h)
Or, setting the frequency directly, non-relative (when Byte 0 is >=F0h):
Byte 0 Upper 4bit of frequency, plus F0h ;PSG Register 01h,03h,05h
Byte 1 Lower 8bit of frequency ;PSG Register 00h,02h,04h
Byte 2 Duration (in 1/100 seconds) (01h..FFh, or 00h=100h)
Equivalent to BASIC's "ENT".

== Sound Reset ==
BCA7 SOUND_RESET
Reset and mute sound output.

== Sound Check ==
BCAD SOUND_CHECK
In: A=channel mask, Out: A=channel status.

== Sound Event ==
BCB0 SOUND_ARM_EVENT
In: A=channel mask, HL=event block.
Equivalent to BASIC's "ON SQ GOSUB". Triggers when the channels queue is not full?

== Sound Release ==
BCB3 SOUND_RELEASE
In: A=channel mask.
Starts pending sounds (which did have the "Hold" bit set; ie. Bit6 of Byte0 passed to SOUND_QUEUE).
Equivalent to BASIC's "RELEASE".

== Sound Pause/Unpause ==
BCB6 SOUND_PAUSE ;Out: CY=1=okay, CY=0=nothing to do.
BCB9 SOUND_UNPAUSE
Freezes/unfreezes sound output.

== Get Envelope ==
BCC2 SOUND_GET_ENV
BCC5 SOUND_GET_ENT
In: A=Envelope number (01h..0Fh), Out: HL=16-byte block, CY=1=okay.

== Machine Pack ==
BD34 MC_SOUND_REGISTER ;in: A=PSG index, C=PSG data
Directly writes to a PSG register (this would conflict with the other SOUND functions).

← Older revision		Revision as of 16:41, 19 December 2010
Line 78:		Line 78:
	BD34 MC_SOUND_REGISTER ;in: A=PSG index, C=PSG data		BD34 MC_SOUND_REGISTER ;in: A=PSG index, C=PSG data
	Directly writes to a PSG register (this would conflict with the other SOUND functions).		Directly writes to a PSG register (this would conflict with the other SOUND functions).
		+	[[Category:BIOS]]

@@ Line 35: / Line 35: @@
 In: A=Envelope number (1..15), HL=Pointer to Data (must be >3FFFh)
 The data block starts with a header byte:
-   bit7    repeat flag (0=one shot, 1=repeat envelope)
+   bit7    envelope type (0=software, 1=hardware)
-   bit6-0  number of following 3-byte parameters (1..5)
+  bit6    repeat flag (0=one shot, 1=repeat envelope)
 The following 3-byte parameters can be (when Byte 0 is <F0h):
    Byte 0  Number of steps (01h..EFh)

@@ Line 18: / Line 18: @@
 In: A=Envelope number (1..15), HL=Pointer to Data (must be >3FFFh)
 The data block starts with a header byte:
-   bit7-0  number of following 3-byte parameters (1..5)
+   bit6-0  number of following 3-byte parameters (1..5)
 The following 3-byte parameters can be (when Byte 0, Bit7=0):
    Byte 0  Number of steps (01h..7Fh)