WonderWitch/FreyaBIOS/Sound

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

Interrupts

INT $15/AH=$00 - sound_init

• AH = $00

INT $15/AH=$01 - sound_set_channel

• AH = $01
• BL = Channel Control value

INT $15/AH=$02 - sound_get_channel

• AH = $02

Return:

• AL = Channel Control value

INT $15/AH=$03 - sound_set_output

• AH = $03
• BL = Output Control value

INT $15/AH=$04 - sound_get_output

• AH = $04

Return:

• AL = Output Control value

INT $15/AH=$05 - sound_set_wave

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

INT $15/AH=$06 - sound_set_pitch

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

INT $15/AH=$07 - sound_get_pitch

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

Return:

• AX = Frequency divider (0 - 2047)

INT $15/AH=$08 - sound_set_volume

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

INT $15/AH=$09 - sound_get_volume

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

Return:

• AL = Channel Volume value

INT $15/AH=$0A - sound_set_sweep

• AH = $0A
• BL = Sweep Amount
• CL = Sweep Ticks

INT $15/AH=$0B - sound_get_sweep

• AH = $0B

Return:

• AL = Sweep Amount
• AH = Sweep Ticks

INT $15/AH=$0C - sound_set_noise

• AH = $0C
• BL = Channel 4 Noise Control value

INT $15/AH=$0D - sound_get_noise

• AH = $0D

Return:

• AL = Channel 4 Noise Control value

INT $15/AH=$0E - sound_get_random

• AH = $0E

Return:

• AX = Channel 4 LFSR Register value