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SNES: CX4 DMA timing fix - #289
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…slowdown in Morph Moth fight)
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DMA to internal RAM was taking 2+WS cycles per byte instead of 1+WS as described in ikari's RE notes. I fixed this by removing the extra cycle that was being added on internal RAM access. This primarily fixes excessive slowdown during the Morph Moth fight: https://www.youtube.com/watch?v=b8YtjKAxtGU
cx4test still passes, though this wouldn't have touched that anyway:
