23 lines
468 B
ArmAsm
23 lines
468 B
ArmAsm
tracker_init:
|
|
|
|
; setup initial ay-3-8910 values (this depends on song)
|
|
|
|
init_registers_to_zero:
|
|
ldx #$13 ; zero $70--$83
|
|
lda #0
|
|
; sta SONG_OFFSET ; also init song stuff
|
|
; sta SONG_COUNTDOWN
|
|
init_loop:
|
|
sta AY_REGS,X
|
|
dex
|
|
bpl init_loop
|
|
|
|
lda #$38
|
|
sta AY_REGS+7 ; $07 mixer (ABC on)
|
|
lda #$0E
|
|
sta AY_REGS+8 ; $08 volume A
|
|
lda #$0C
|
|
sta AY_REGS+9 ; $09 volume B
|
|
sta AY_REGS+10 ; $0A volume C
|
|
|