<https://forums.atariage.com/topic/349547-320-mode-colours-question/page/3/#comment-5269688>
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"To make this work (and scroll) in 320c we need make tiles much wider than 16px, otherwise we will run out of dma cycles. 20 tiles 16x16 = ((4*3)+8)*20= 400cycles!\n \n\n\n\tAny empty tiles will give us some dma back. \n \n\n\n\tSome tiles will have to be 32,48,64 pixels wide or even more.\n \n\n\n\tYou can draw them in RAM (I believe that Rikki was using something like this)\n \n\n\n\t \n \n\n\n\texample:\n \n\n\n\t \n \n\n\n\t \n"
<https://forums.atariage.com/topic/349547-320-mode-colours-question/page/3/>