dos33fsprogs/music/tiny_tracker4/tracker_init.s
2022-01-15 15:41:53 -05:00

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