trying clean disable of interrupts

dither4.s

@@ -8,6 +8,7 @@ COLPF2 = $D018
 COLPF3 = $D019
 COLBK = $D01A
 
+DMACTL = $D400
 WSYNC = $D40A
 VCOUNT = $D40B
 NMIEN = $D40E
@@ -82,7 +83,7 @@ displaylist:
 
     ; Disable display DMA
     lda #$00
-    sta SDMCTL
+    sta DMACTL
 
     ; Set up the display list
     lda #.lobyte(displaylist)
@@ -90,10 +91,6 @@ displaylist:
     lda #.hibyte(displaylist)
     sta SDLSTH
 
-    ; Disable VBI and DLI but allow Reset
-    lda #(128 + 64)
-    sta NMIEN
-
     ; Manually wait for first scan line
 wait_vblank:
     lda VCOUNT
@@ -101,7 +98,12 @@ wait_vblank:
 
     ; Re-enable display DMA
     lda #$22
-    sta SDMCTL
+    sta DMACTL
+
+    ; Disable VBI and DLI but allow Reset
+    lda #32
+    sta NMIEN
+
 
 wait_loop:
     sta WSYNC