WonderWitch/FreyaBIOS/Sound

The Sound interrupt provides an abstraction layer for the WonderSwan's sound hardware.

Interrupts

INT 15/AH=00h - sound_init

• AH = 00h

INT 15/AH=01h - sound_set_channel

• AH = 01h
• BL = Channel Control value

INT 15/AH=02h - sound_get_channel

• AH = 02h

Return:

• AL = Channel Control value

INT 15/AH=03h - sound_set_output

• AH = 03h
• BL = Output Control value

INT 15/AH=04h - sound_get_output

• AH = 04h

Return:

• AL = Output Control value

INT 15/AH=05h - sound_set_wave

• AH = 05h
• AL = Channel (0, 1, 2, 3)
• DS:DX = Pointer to waveform data (16 bytes)

INT 15/AH=06h - sound_set_pitch

• AH = 06h
• AL = Channel (0, 1, 2, 3)
• BX = Frequency divider (0 - 2047)

INT 15/AH=07h - sound_get_pitch

• AH = 07h
• AL = Channel (0, 1, 2, 3)

Return:

• AX = Frequency divider (0 - 2047)

INT 15/AH=08h - sound_set_volume

• AH = 08h
• AL = Channel (0, 1, 2, 3)
• BL = Channel Volume value

INT 15/AH=09h - sound_get_volume

• AH = 09h
• AL = Channel (0, 1, 2, 3)

Return:

• AL = Channel Volume value

INT 15/AH=0Ah - sound_set_sweep

• AH = 0Ah
• BL = Sweep Amount
• CL = Sweep Ticks

INT 15/AH=0Bh - sound_get_sweep

• AH = 0Bh

Return:

• AL = Sweep Amount
• AH = Sweep Ticks

INT 15/AH=0Ch - sound_set_noise

• AH = 0Ch
• BL = Channel 4 Noise Control value

INT 15/AH=0Dh - sound_get_noise

• AH = 0Dh

Return:

• AL = Channel 4 Noise Control value

INT 15/AH=0Eh - sound_get_random

• AH = 0Eh

Return:

• AX = Channel 4 LFSR Register value