dos33fsprogs/music/tiny_tracker3/tracker_init.s
2022-01-12 16:06:46 -05:00

24 lines
451 B
ArmAsm

tracker_init:
; setup initial ay-3-8910 values (this depends on song)
init_registers_to_zero:
ldx #$13 ; clear more than have to for other
lda #0 ; vars
; sta SONG_OFFSET ; also in
; sta SONG_COUNTDOWN
init_loop:
sta AY_REGS,X
dex
bpl init_loop
; jsr ay3_write_regs
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