Save and restore the accumulator in the interrupt handler.

2016-10-05 23:27:51 -04:00 · 2016-10-05 23:27:51 -04:00 · 9bb4f83010
parent 84a08225de
commit 9bb4f83010
1 changed files with 2 additions and 1 deletions
--- a/mocktest/speech.s
+++ b/mocktest/speech.s
@ -85,6 +85,7 @@ _busy:          .byte   $00


 .proc _interr
+    PHA
    TXA             ;SAVE REGISTERS
    PHA
    TYA
@ -120,7 +121,7 @@ _busy:          .byte   $00
    TAY
    PLA
    TAX
-    LDA $45
+    PLA
    RTI             ;RETURN FROM INTERRUPT

@L1: