dos33fsprogs/mist/simple_sounds.s

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;============================
; click the speaker
;============================
; FIXME: make it last longer?
click_speaker:
lda SOUND_STATUS
bmi done_click
bit $c030
done_click:
rts
;===========================
; BEEP (inlined)
;===========================
beep:
lda SOUND_STATUS
bmi done_beep
ldy #235
sty tone_smc+1
; BEEP
; repeat 30 times
lda #30 ; 2
tone1_loop:
tone_smc:
ldy #24 ; 2
loopC: ldx #6 ; 2
loopD: dex ; 1
bne loopD ; 2
dey ; 1
bne loopC ; 2
bit SPEAKER ; 3 ; click speaker
sec ; 1
sbc #1 ; 2
bne tone1_loop ; 2
; Try X=6 Y=21 cycles=757
; Try X=6 Y=24 cycles=865
; Try X=7 Y=235 cycles=9636
done_beep:
rts