2 CPU
  +---------------------------------------------------------------+

  '-' = idle bus cycle (reads from the last byte of the video bank)
  '+' = idle bus cycle (just like '-', but reads from
        video_bank_base_address + $39FF if ECM (<A HREF="VIC17.HTM">$D011</A> Bit 6) is selected)

   &lt;num&gt; = pointer fetch for sprite &lt;num&gt;  ;  r = memory refresh cycle
   s = sprite data fetch  ;  N = extra '-' cycles for NTSC added here

   x  = processor executes instructions (BA high, AEC high)
  