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mockingboard: trying to get IRQ handler working on II+/IIe

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This commit is contained in:
Vince Weaver 2018-10-29 12:04:19 -04:00
parent f677ea9ac0
commit 63b251cb7d
1 changed files with 3 additions and 3 deletions
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6
megademo/mockingboard.s
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@ -148,12 +148,14 @@ reset_ay_right:
interrupt_handler: interrupt_handler:
; A saved by firmware in $45 ; A saved by firmware in $45
sta $45 ; sta $45
txa txa
pha ; save X pha ; save X
tya tya
pha ; save Y pha ; save Y
bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
jsr play_music jsr play_music
pla pla
@ -162,8 +164,6 @@ interrupt_handler:
tax ; restore X tax ; restore X
lda $45 ; restore A lda $45 ; restore A
bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
rti ; return from interrupt ; 6 rti ; return from interrupt ; 6