actually thsi adds the interrupt update loop

Async.inc

@@ -272,7 +272,7 @@ Async_EarlyReturn:
   
   ; unset next call
   ld hl, rIE  
-  res 1, [hl] ; disable vblank
+  res 1, [hl] ; disable stat interrupt
   ld hl, rIF 
   res 1, [hl] ; clear the interrupt 
   

main.asm

@@ -56,10 +56,15 @@ def VARIABLE_TILES_START equ 26
 
 INCLUDE "hardware.inc"
 SECTION "Interrupts", ROM0[$0]
-  ds $48 - @, 0
+  ds INT_HANDLER_VBLANK - @, 0
+  reti
+  
+  ds INT_HANDLER_STAT - @, 0
   call INTERRUPT_LCD - 1
   ret
 
+  
+
 SECTION "Header", ROM0[$100]
 
   jp EntryPoint
@@ -270,9 +275,14 @@ Loop:
   call SoundUpdate
 println "scene update is ", SCENE_UPDATE - 1
   call SCENE_UPDATE - 1 ; hope this takes not too many scanlines!
-  ld b, 144
-  call AwaitLine
 
+  di
+  ld a, [rIE]
+  or a, IEF_VBLANK
+  ld [rIE], a 
+  ei
+  
+  halt
 
 println "scene draw is ", SCENE_DRAW - 1
   call SCENE_DRAW - 1 ; hope this takes fewer than 9 scanlines! 
@@ -286,6 +296,7 @@ println "scene draw is ", SCENE_DRAW - 1
   jp Loop
   
 SoundUpdate:
+  ret
 
 ChangeScene: ; hl should be a pointer to, in sequence, setup update draw teardown
   ;call SCENE_TEARDOWN - 1