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change storage to pager zero

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fix bug that kills keyboard.
This commit is contained in:
Mariano Dominguez 2023-01-15 17:00:05 -08:00
parent 42c39c6bfc
commit 6236e82850
1 changed files with 7 additions and 9 deletions
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16
libsrc/atari/sound.s
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@ -7,11 +7,13 @@
.include "atari.inc"
.export __sound
.import popa
.importzp tmp1,tmp2
; play sound, arguments: voice, pitch, distortion, volume. same as BASIC
.proc __sound
sta STORE2 ;save volume
sta tmp2 ;save volume
jsr popa ;get distortion
sta STORE1 ;save distortion
sta tmp1 ;save distortion
jsr popa ;get pitch
pha ;save in stack
jsr popa ;get voice
@ -22,18 +24,14 @@
lda #0
sta AUDCTL
lda #3
stx SKCTL ;init sound
lda STORE1 ;get distortion
sta SKCTL ;init sound
lda tmp1 ;get distortion
asl a ;ignore the high nibble
asl a
asl a
asl a
clc ;setup for adding volume
adc STORE2 ;add volume
adc tmp2 ;add volume
sta AUDC1,x ;volume + distortion in control channel
rts
.endproc
;reserve 2 bytes for temp storage
.bss
STORE1: .res 1
STORE2: .res 1