diff --git a/mainmem.init.s b/mainmem.init.s
index 324c49d..21b0a05 100644
--- a/mainmem.init.s
+++ b/mainmem.init.s
@@ -8,13 +8,17 @@
 
 AUDIOCARD    DB   $00                ; $00 = Mockingboard, $01 = Ensoniq
 
+
 * Trampoline in main memory used by aux memory IRQ handler
 * to invoke Apple II / ProDOS IRQs in main memory
 A2IRQ        >>>   IENTMAIN          ; IENTMAIN does not do CLI
-             JSR   A2IRQ2
-             >>>   XF2AUX,IRQBRKRET
-A2IRQ2       PHP                     ; Fake things to look like IRQ
+             LDA   #>A2IRQRET
+             PHA
+             LDA   #<A2IRQRET
+             PHA
+             PHP                     ; Fake things to look like IRQ
              JMP   (A2IRQV)          ; Call Apple II ProDOS ISR
+A2IRQRET     >>>   XF2AUX,IRQBRKRET
 
 
 * BRK handler in main memory. Used on Apple IIgs only.