tweaks; looks good now

had to remove the extra overscan at the bottom, it left things confused

dither4.s

@@ -37,10 +37,12 @@ pages_per_frame = 32
 .import bitmap
 
 displaylist:
-    ; @fixme resolve the line counts
+    ; 24 lines overscan
     .repeat 3
         .byte $70 ; 8 blank lines
     .endrep
+
+    ; 192 lines graphics
     ; ANTIC mode e (160px 2bpp, 1 scan line per line)
     .byte $4e
     .addr framebuffer
@@ -52,9 +54,7 @@ displaylist:
     .repeat height / 2 - 1
         .byte $0e
     .endrep
-    .repeat 3
-        .byte $70 ; 8 blank lines
-    .endrep
+
     .byte $41 ; jump and blank
     .addr displaylist
 
@@ -105,12 +105,12 @@ wait_vblank:
     lda #$22
     sta DMACTL
 
-wait_loop:
-    sta WSYNC
 wait_start:
+wait_loop:
     lda VCOUNT
     cmp #15
     bne wait_loop
+    STA WSYNC
     ldy #0
 
 each_scanline: