Added check IRQ is from Mockingboard.

2022-11-24 17:32:46 -05:00 · 2022-11-24 17:32:46 -05:00 · 5ccc5e47af
parent ba8b916e16
commit 5ccc5e47af
2 changed files with 5 additions and 2 deletions
--- a/applecorn.po
+++ b/applecorn.po
--- a/mainmem.mock.s
+++ b/mainmem.mock.s
@ -158,8 +158,11 @@ MOCKAMP     PHX

 * Mockingboard interrupt service routine - just calls generic audio ISR
 MOCKISR     CLD
-* TODO: Check whether interrupt is from Mockingboard or not
-            BIT   MOCK_6522_T1CL           ; Clear interrupt
+            BIT   MOCK_6522_IFR            ; See if interrupt was from MB
+            BMI   :MOCK                    ; Yes
+            SEC                            ; We did not service irc
+            RTS
+:MOCK       BIT   MOCK_6522_T1CL           ; Clear interrupt
            JSR   AUDIOISR
            CLC                            ; CC indicates we serviced irq
            RTS